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Edit File : kses.php \| Size : 61.88 KB
<?php /** * kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes * Copyright (C) 2002, 2003, 2005 Ulf Harnhammar * * This program is free software and open source software; you can redistribute * it and/or modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the License, * or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA * http://www.gnu.org/licenses/gpl.html * * [kses strips evil scripts!] * * Added wp_ prefix to avoid conflicts with existing kses users * * @version 0.2.2 * @copyright (C) 2002, 2003, 2005 * @author Ulf Harnhammar <http://advogato.org/person/metaur/> * * @package External * @subpackage KSES / /* * Specifies the default allowable HTML tags. * * Using `CUSTOM_TAGS` is not recommended and should be considered deprecated. The * {@see 'wp_kses_allowed_html'} filter is more powerful and supplies context. * * @see wp_kses_allowed_html() * @since 1.2.0 * * @var array[]\|bool Array of default allowable HTML tags, or false to use the defaults. / if ( ! defined( 'CUSTOM_TAGS' ) ) { define( 'CUSTOM_TAGS', false ); } // Ensure that these variables are added to the global namespace // (e.g. if using namespaces / autoload in the current PHP environment). global $allowedposttags, $allowedtags, $allowedentitynames, $allowedxmlentitynames; if ( ! CUSTOM_TAGS ) { /* * KSES global for default allowable HTML tags. * * Can be overridden with the `CUSTOM_TAGS` constant. * * @var array[] $allowedposttags Array of default allowable HTML tags. * @since 2.0.0 / $allowedposttags = array( 'address' => array(), 'a' => array( 'href' => true, 'rel' => true, 'rev' => true, 'name' => true, 'target' => true, 'download' => array( 'valueless' => 'y', ), ), 'abbr' => array(), 'acronym' => array(), 'area' => array( 'alt' => true, 'coords' => true, 'href' => true, 'nohref' => true, 'shape' => true, 'target' => true, ), 'article' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'aside' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'audio' => array( 'autoplay' => true, 'controls' => true, 'loop' => true, 'muted' => true, 'preload' => true, 'src' => true, ), 'b' => array(), 'bdo' => array( 'dir' => true, ), 'big' => array(), 'blockquote' => array( 'cite' => true, 'lang' => true, 'xml:lang' => true, ), 'br' => array(), 'button' => array( 'disabled' => true, 'name' => true, 'type' => true, 'value' => true, ), 'caption' => array( 'align' => true, ), 'cite' => array( 'dir' => true, 'lang' => true, ), 'code' => array(), 'col' => array( 'align' => true, 'char' => true, 'charoff' => true, 'span' => true, 'dir' => true, 'valign' => true, 'width' => true, ), 'colgroup' => array( 'align' => true, 'char' => true, 'charoff' => true, 'span' => true, 'valign' => true, 'width' => true, ), 'del' => array( 'datetime' => true, ), 'dd' => array(), 'dfn' => array(), 'details' => array( 'align' => true, 'dir' => true, 'lang' => true, 'open' => true, 'xml:lang' => true, ), 'div' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'dl' => array(), 'dt' => array(), 'em' => array(), 'fieldset' => array(), 'figure' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'figcaption' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'font' => array( 'color' => true, 'face' => true, 'size' => true, ), 'footer' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'h1' => array( 'align' => true, ), 'h2' => array( 'align' => true, ), 'h3' => array( 'align' => true, ), 'h4' => array( 'align' => true, ), 'h5' => array( 'align' => true, ), 'h6' => array( 'align' => true, ), 'header' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'hgroup' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'hr' => array( 'align' => true, 'noshade' => true, 'size' => true, 'width' => true, ), 'i' => array(), 'img' => array( 'alt' => true, 'align' => true, 'border' => true, 'height' => true, 'hspace' => true, 'loading' => true, 'longdesc' => true, 'vspace' => true, 'src' => true, 'usemap' => true, 'width' => true, ), 'ins' => array( 'datetime' => true, 'cite' => true, ), 'kbd' => array(), 'label' => array( 'for' => true, ), 'legend' => array( 'align' => true, ), 'li' => array( 'align' => true, 'value' => true, ), 'map' => array( 'name' => true, ), 'mark' => array(), 'menu' => array( 'type' => true, ), 'nav' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'p' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'pre' => array( 'width' => true, ), 'q' => array( 'cite' => true, ), 's' => array(), 'samp' => array(), 'span' => array( 'dir' => true, 'align' => true, 'lang' => true, 'xml:lang' => true, ), 'section' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'small' => array(), 'strike' => array(), 'strong' => array(), 'sub' => array(), 'summary' => array( 'align' => true, 'dir' => true, 'lang' => true, 'xml:lang' => true, ), 'sup' => array(), 'table' => array( 'align' => true, 'bgcolor' => true, 'border' => true, 'cellpadding' => true, 'cellspacing' => true, 'dir' => true, 'rules' => true, 'summary' => true, 'width' => true, ), 'tbody' => array( 'align' => true, 'char' => true, 'charoff' => true, 'valign' => true, ), 'td' => array( 'abbr' => true, 'align' => true, 'axis' => true, 'bgcolor' => true, 'char' => true, 'charoff' => true, 'colspan' => true, 'dir' => true, 'headers' => true, 'height' => true, 'nowrap' => true, 'rowspan' => true, 'scope' => true, 'valign' => true, 'width' => true, ), 'textarea' => array( 'cols' => true, 'rows' => true, 'disabled' => true, 'name' => true, 'readonly' => true, ), 'tfoot' => array( 'align' => true, 'char' => true, 'charoff' => true, 'valign' => true, ), 'th' => array( 'abbr' => true, 'align' => true, 'axis' => true, 'bgcolor' => true, 'char' => true, 'charoff' => true, 'colspan' => true, 'headers' => true, 'height' => true, 'nowrap' => true, 'rowspan' => true, 'scope' => true, 'valign' => true, 'width' => true, ), 'thead' => array( 'align' => true, 'char' => true, 'charoff' => true, 'valign' => true, ), 'title' => array(), 'tr' => array( 'align' => true, 'bgcolor' => true, 'char' => true, 'charoff' => true, 'valign' => true, ), 'track' => array( 'default' => true, 'kind' => true, 'label' => true, 'src' => true, 'srclang' => true, ), 'tt' => array(), 'u' => array(), 'ul' => array( 'type' => true, ), 'ol' => array( 'start' => true, 'type' => true, 'reversed' => true, ), 'var' => array(), 'video' => array( 'autoplay' => true, 'controls' => true, 'height' => true, 'loop' => true, 'muted' => true, 'playsinline' => true, 'poster' => true, 'preload' => true, 'src' => true, 'width' => true, ), ); /* * @var array[] $allowedtags Array of KSES allowed HTML elements. * @since 1.0.0 / $allowedtags = array( 'a' => array( 'href' => true, 'title' => true, ), 'abbr' => array( 'title' => true, ), 'acronym' => array( 'title' => true, ), 'b' => array(), 'blockquote' => array( 'cite' => true, ), 'cite' => array(), 'code' => array(), 'del' => array( 'datetime' => true, ), 'em' => array(), 'i' => array(), 'q' => array( 'cite' => true, ), 's' => array(), 'strike' => array(), 'strong' => array(), ); /* * @var string[] $allowedentitynames Array of KSES allowed HTML entitity names. * @since 1.0.0 / $allowedentitynames = array( 'nbsp', 'iexcl', 'cent', 'pound', 'curren', 'yen', 'brvbar', 'sect', 'uml', 'copy', 'ordf', 'laquo', 'not', 'shy', 'reg', 'macr', 'deg', 'plusmn', 'acute', 'micro', 'para', 'middot', 'cedil', 'ordm', 'raquo', 'iquest', 'Agrave', 'Aacute', 'Acirc', 'Atilde', 'Auml', 'Aring', 'AElig', 'Ccedil', 'Egrave', 'Eacute', 'Ecirc', 'Euml', 'Igrave', 'Iacute', 'Icirc', 'Iuml', 'ETH', 'Ntilde', 'Ograve', 'Oacute', 'Ocirc', 'Otilde', 'Ouml', 'times', 'Oslash', 'Ugrave', 'Uacute', 'Ucirc', 'Uuml', 'Yacute', 'THORN', 'szlig', 'agrave', 'aacute', 'acirc', 'atilde', 'auml', 'aring', 'aelig', 'ccedil', 'egrave', 'eacute', 'ecirc', 'euml', 'igrave', 'iacute', 'icirc', 'iuml', 'eth', 'ntilde', 'ograve', 'oacute', 'ocirc', 'otilde', 'ouml', 'divide', 'oslash', 'ugrave', 'uacute', 'ucirc', 'uuml', 'yacute', 'thorn', 'yuml', 'quot', 'amp', 'lt', 'gt', 'apos', 'OElig', 'oelig', 'Scaron', 'scaron', 'Yuml', 'circ', 'tilde', 'ensp', 'emsp', 'thinsp', 'zwnj', 'zwj', 'lrm', 'rlm', 'ndash', 'mdash', 'lsquo', 'rsquo', 'sbquo', 'ldquo', 'rdquo', 'bdquo', 'dagger', 'Dagger', 'permil', 'lsaquo', 'rsaquo', 'euro', 'fnof', 'Alpha', 'Beta', 'Gamma', 'Delta', 'Epsilon', 'Zeta', 'Eta', 'Theta', 'Iota', 'Kappa', 'Lambda', 'Mu', 'Nu', 'Xi', 'Omicron', 'Pi', 'Rho', 'Sigma', 'Tau', 'Upsilon', 'Phi', 'Chi', 'Psi', 'Omega', 'alpha', 'beta', 'gamma', 'delta', 'epsilon', 'zeta', 'eta', 'theta', 'iota', 'kappa', 'lambda', 'mu', 'nu', 'xi', 'omicron', 'pi', 'rho', 'sigmaf', 'sigma', 'tau', 'upsilon', 'phi', 'chi', 'psi', 'omega', 'thetasym', 'upsih', 'piv', 'bull', 'hellip', 'prime', 'Prime', 'oline', 'frasl', 'weierp', 'image', 'real', 'trade', 'alefsym', 'larr', 'uarr', 'rarr', 'darr', 'harr', 'crarr', 'lArr', 'uArr', 'rArr', 'dArr', 'hArr', 'forall', 'part', 'exist', 'empty', 'nabla', 'isin', 'notin', 'ni', 'prod', 'sum', 'minus', 'lowast', 'radic', 'prop', 'infin', 'ang', 'and', 'or', 'cap', 'cup', 'int', 'sim', 'cong', 'asymp', 'ne', 'equiv', 'le', 'ge', 'sub', 'sup', 'nsub', 'sube', 'supe', 'oplus', 'otimes', 'perp', 'sdot', 'lceil', 'rceil', 'lfloor', 'rfloor', 'lang', 'rang', 'loz', 'spades', 'clubs', 'hearts', 'diams', 'sup1', 'sup2', 'sup3', 'frac14', 'frac12', 'frac34', 'there4', ); /* * @var string[] $allowedxmlentitynames Array of KSES allowed XML entitity names. * @since 5.5.0 / $allowedxmlnamedentities = array( 'amp', 'lt', 'gt', 'apos', 'quot', ); $allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags ); } else { $allowedtags = wp_kses_array_lc( $allowedtags ); $allowedposttags = wp_kses_array_lc( $allowedposttags ); } /* * Filters text content and strips out disallowed HTML. * * This function makes sure that only the allowed HTML element names, attribute * names, attribute values, and HTML entities will occur in the given text string. * * This function expects unslashed data. * * @see wp_kses_post() for specifically filtering post content and fields. * @see wp_allowed_protocols() for the default allowed protocols in link URLs. * * @since 1.0.0 * * @param string $string Text content to filter. * @param array[]\|string $allowed_html An array of allowed HTML elements and attributes, * or a context name such as 'post'. See wp_kses_allowed_html() * for the list of accepted context names. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return string Filtered content containing only the allowed HTML. / function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) { if ( empty( $allowed_protocols ) ) { $allowed_protocols = wp_allowed_protocols(); } $string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) ); $string = wp_kses_normalize_entities( $string ); $string = wp_kses_hook( $string, $allowed_html, $allowed_protocols ); return wp_kses_split( $string, $allowed_html, $allowed_protocols ); } /* * Filters one HTML attribute and ensures its value is allowed. * * This function can escape data in some situations where `wp_kses()` must strip the whole attribute. * * @since 4.2.3 * * @param string $string The 'whole' attribute, including name and value. * @param string $element The HTML element name to which the attribute belongs. * @return string Filtered attribute. / function wp_kses_one_attr( $string, $element ) { $uris = wp_kses_uri_attributes(); $allowed_html = wp_kses_allowed_html( 'post' ); $allowed_protocols = wp_allowed_protocols(); $string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) ); // Preserve leading and trailing whitespace. $matches = array(); preg_match( '/^\s/', $string, $matches ); $lead = $matches[0]; preg_match( '/\s$/', $string, $matches ); $trail = $matches[0]; if ( empty( $trail ) ) { $string = substr( $string, strlen( $lead ) ); } else { $string = substr( $string, strlen( $lead ), -strlen( $trail ) ); } // Parse attribute name and value from input. $split = preg_split( '/\s=\s/', $string, 2 ); $name = $split[0]; if ( count( $split ) == 2 ) { $value = $split[1]; // Remove quotes surrounding $value. // Also guarantee correct quoting in $string for this one attribute. if ( '' === $value ) { $quote = ''; } else { $quote = $value[0]; } if ( '"' === $quote \|\| "'" === $quote ) { if ( substr( $value, -1 ) != $quote ) { return ''; } $value = substr( $value, 1, -1 ); } else { $quote = '"'; } // Sanitize quotes, angle braces, and entities. $value = esc_attr( $value ); // Sanitize URI values. if ( in_array( strtolower( $name ), $uris, true ) ) { $value = wp_kses_bad_protocol( $value, $allowed_protocols ); } $string = "$name=$quote$value$quote"; $vless = 'n'; } else { $value = ''; $vless = 'y'; } // Sanitize attribute by name. wp_kses_attr_check( $name, $value, $string, $vless, $element, $allowed_html ); // Restore whitespace. return $lead . $string . $trail; } /* * Returns an array of allowed HTML tags and attributes for a given context. * * @since 3.5.0 * @since 5.0.1 `form` removed as allowable HTML tag. * * @global array $allowedposttags * @global array $allowedtags * @global array $allowedentitynames * * @param string\|array $context The context for which to retrieve tags. Allowed values are 'post', * 'strip', 'data', 'entities', or the name of a field filter such as * 'pre_user_description'. * @return array Array of allowed HTML tags and their allowed attributes. / function wp_kses_allowed_html( $context = '' ) { global $allowedposttags, $allowedtags, $allowedentitynames; if ( is_array( $context ) ) { /* * Filters the HTML that is allowed for a given context. * * @since 3.5.0 * * @param array[]\|string $context Context to judge allowed tags by. * @param string $context_type Context name. / return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' ); } switch ( $context ) { case 'post': /* This filter is documented in wp-includes/kses.php / $tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context ); // 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`. if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) \|\| isset( $tags['select'] ) ) ) { $tags = $allowedposttags; $tags['form'] = array( 'action' => true, 'accept' => true, 'accept-charset' => true, 'enctype' => true, 'method' => true, 'name' => true, 'target' => true, ); /* This filter is documented in wp-includes/kses.php / $tags = apply_filters( 'wp_kses_allowed_html', $tags, $context ); } return $tags; case 'user_description': case 'pre_user_description': $tags = $allowedtags; $tags['a']['rel'] = true; /* This filter is documented in wp-includes/kses.php / return apply_filters( 'wp_kses_allowed_html', $tags, $context ); case 'strip': /* This filter is documented in wp-includes/kses.php / return apply_filters( 'wp_kses_allowed_html', array(), $context ); case 'entities': /* This filter is documented in wp-includes/kses.php / return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context ); case 'data': default: /* This filter is documented in wp-includes/kses.php / return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context ); } } /* * You add any KSES hooks here. * * There is currently only one KSES WordPress hook, {@see 'pre_kses'}, and it is called here. * All parameters are passed to the hooks and expected to receive a string. * * @since 1.0.0 * * @param string $string Content to filter through KSES. * @param array[]\|string $allowed_html An array of allowed HTML elements and attributes, * or a context name such as 'post'. See wp_kses_allowed_html() * for the list of accepted context names. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return string Filtered content through {@see 'pre_kses'} hook. / function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) { /* * Filters content to be run through KSES. * * @since 2.3.0 * * @param string $string Content to filter through KSES. * @param array[]\|string $allowed_html An array of allowed HTML elements and attributes, * or a context name such as 'post'. See wp_kses_allowed_html() * for the list of accepted context names. * @param string[] $allowed_protocols Array of allowed URL protocols. / return apply_filters( 'pre_kses', $string, $allowed_html, $allowed_protocols ); } /* * Returns the version number of KSES. * * @since 1.0.0 * * @return string KSES version number. / function wp_kses_version() { return '0.2.2'; } /* * Searches for HTML tags, no matter how malformed. * * It also matches stray `>` characters. * * @since 1.0.0 * * @global array[]\|string $pass_allowed_html An array of allowed HTML elements and attributes, * or a context name such as 'post'. * @global string[] $pass_allowed_protocols Array of allowed URL protocols. * * @param string $string Content to filter. * @param array[]\|string $allowed_html An array of allowed HTML elements and attributes, * or a context name such as 'post'. See wp_kses_allowed_html() * for the list of accepted context names. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return string Content with fixed HTML tags / function wp_kses_split( $string, $allowed_html, $allowed_protocols ) { global $pass_allowed_html, $pass_allowed_protocols; $pass_allowed_html = $allowed_html; $pass_allowed_protocols = $allowed_protocols; return preg_replace_callback( '%(<!--.?(-->\|$))\|(<[^>](>\|$)\|>)%', '_wp_kses_split_callback', $string ); } /* * Returns an array of HTML attribute names whose value contains a URL. * * This function returns a list of all HTML attributes that must contain * a URL according to the HTML specification. * * This list includes URI attributes both allowed and disallowed by KSES. * * @link https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes * * @since 5.0.1 * * @return string[] HTML attribute names whose value contains a URL. / function wp_kses_uri_attributes() { $uri_attributes = array( 'action', 'archive', 'background', 'cite', 'classid', 'codebase', 'data', 'formaction', 'href', 'icon', 'longdesc', 'manifest', 'poster', 'profile', 'src', 'usemap', 'xmlns', ); /* * Filters the list of attributes that are required to contain a URL. * * Use this filter to add any `data-` attributes that are required to be * validated as a URL. * * @since 5.0.1 * * @param string[] $uri_attributes HTML attribute names whose value contains a URL. / $uri_attributes = apply_filters( 'wp_kses_uri_attributes', $uri_attributes ); return $uri_attributes; } /* * Callback for `wp_kses_split()`. * * @since 3.1.0 * @access private * @ignore * * @global array[]\|string $pass_allowed_html An array of allowed HTML elements and attributes, * or a context name such as 'post'. * @global string[] $pass_allowed_protocols Array of allowed URL protocols. * * @param array $matches preg_replace regexp matches * @return string / function _wp_kses_split_callback( $match ) { global $pass_allowed_html, $pass_allowed_protocols; return wp_kses_split2( $match[0], $pass_allowed_html, $pass_allowed_protocols ); } /* * Callback for `wp_kses_split()` for fixing malformed HTML tags. * * This function does a lot of work. It rejects some very malformed things like * `<:::>`. It returns an empty string, if the element isn't allowed (look ma, no * `strip_tags()`!). Otherwise it splits the tag into an element and an attribute * list. * * After the tag is split into an element and an attribute list, it is run * through another filter which will remove illegal attributes and once that is * completed, will be returned. * * @access private * @ignore * @since 1.0.0 * * @param string $string Content to filter. * @param array[]\|string $allowed_html An array of allowed HTML elements and attributes, * or a context name such as 'post'. See wp_kses_allowed_html() * for the list of accepted context names. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return string Fixed HTML element / function wp_kses_split2( $string, $allowed_html, $allowed_protocols ) { $string = wp_kses_stripslashes( $string ); // It matched a ">" character. if ( '<' !== substr( $string, 0, 1 ) ) { return '>'; } // Allow HTML comments. if ( '<!--' === substr( $string, 0, 4 ) ) { $string = str_replace( array( '<!--', '-->' ), '', $string ); while ( ( $newstring = wp_kses( $string, $allowed_html, $allowed_protocols ) ) != $string ) { $string = $newstring; } if ( '' === $string ) { return ''; } // Prevent multiple dashes in comments. $string = preg_replace( '/--+/', '-', $string ); // Prevent three dashes closing a comment. $string = preg_replace( '/-$/', '', $string ); return "<!--{$string}-->"; } // It's seriously malformed. if ( ! preg_match( '%^<\s(/\s)?([a-zA-Z0-9-]+)([^>])>?$%', $string, $matches ) ) { return ''; } $slash = trim( $matches[1] ); $elem = $matches[2]; $attrlist = $matches[3]; if ( ! is_array( $allowed_html ) ) { $allowed_html = wp_kses_allowed_html( $allowed_html ); } // They are using a not allowed HTML element. if ( ! isset( $allowed_html[ strtolower( $elem ) ] ) ) { return ''; } // No attributes are allowed for closing elements. if ( '' !== $slash ) { return "</$elem>"; } return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols ); } /** * Removes all attributes, if none are allowed for this element. * * If some are allowed it calls `wp_kses_hair()` to split them further, and then * it builds up new HTML code from the data that `kses_hair()` returns. It also * removes `<` and `>` characters, if there are any left. One more thing it does * is to check if the tag has a closing XHTML slash, and if it does, it puts one * in the returned code as well. * * @since 1.0.0 * * @param string $element HTML element/tag. * @param string $attr HTML attributes from HTML element to closing HTML element tag. * @param array[]\|string $allowed_html An array of allowed HTML elements and attributes, * or a context name such as 'post'. See wp_kses_allowed_html() * for the list of accepted context names. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return string Sanitized HTML element. / function wp_kses_attr( $element, $attr, $allowed_html, $allowed_protocols ) { if ( ! is_array( $allowed_html ) ) { $allowed_html = wp_kses_allowed_html( $allowed_html ); } // Is there a closing XHTML slash at the end of the attributes? $xhtml_slash = ''; if ( preg_match( '%\s/\s$%', $attr ) ) { $xhtml_slash = ' /'; } // Are any attributes allowed at all for this element? $element_low = strtolower( $element ); if ( empty( $allowed_html[ $element_low ] ) \|\| true === $allowed_html[ $element_low ] ) { return "<$element$xhtml_slash>"; } // Split it. $attrarr = wp_kses_hair( $attr, $allowed_protocols ); // Go through $attrarr, and save the allowed attributes for this element // in $attr2. $attr2 = ''; foreach ( $attrarr as $arreach ) { if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) { $attr2 .= ' ' . $arreach['whole']; } } // Remove any "<" or ">" characters. $attr2 = preg_replace( '/[<>]/', '', $attr2 ); return "<$element$attr2$xhtml_slash>"; } /* * Determines whether an attribute is allowed. * * @since 4.2.3 * @since 5.0.0 Add support for `data-` wildcard attributes. * @param string $name The attribute name. Passed by reference. Returns empty string when not allowed. * @param string $value The attribute value. Passed by reference. Returns a filtered value. * @param string $whole The `name=value` input. Passed by reference. Returns filtered input. * @param string $vless Whether the attribute is valueless. Use 'y' or 'n'. * @param string $element The name of the element to which this attribute belongs. * @param array $allowed_html The full list of allowed elements and attributes. * @return bool Whether or not the attribute is allowed. / function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) { $name_low = strtolower( $name ); $element_low = strtolower( $element ); if ( ! isset( $allowed_html[ $element_low ] ) ) { $name = ''; $value = ''; $whole = ''; return false; } $allowed_attr = $allowed_html[ $element_low ]; if ( ! isset( $allowed_attr[ $name_low ] ) \|\| '' === $allowed_attr[ $name_low ] ) { / * Allow `data-` attributes. * When specifying `$allowed_html`, the attribute name should be set as * `data-` (not to be mixed with the HTML 4.0 `data` attribute, see https://www.w3.org/TR/html40/struct/objects.html#adef-data). * * Note: the attribute name should only contain `A-Za-z0-9_-` chars, * double hyphens `--` are not accepted by WordPress. / if ( strpos( $name_low, 'data-' ) === 0 && ! empty( $allowed_attr['data-'] ) && preg_match( '/^data(?:-[a-z0-9_]+)+$/', $name_low, $match ) ) { /* * Add the whole attribute name to the allowed attributes and set any restrictions * for the `data-` attribute values for the current element. / $allowed_attr[ $match[0] ] = $allowed_attr['data-']; } else { $name = ''; $value = ''; $whole = ''; return false; } } if ( 'style' === $name_low ) { $new_value = safecss_filter_attr( $value ); if ( empty( $new_value ) ) { $name = ''; $value = ''; $whole = ''; return false; } $whole = str_replace( $value, $new_value, $whole ); $value = $new_value; } if ( is_array( $allowed_attr[ $name_low ] ) ) { // There are some checks. foreach ( $allowed_attr[ $name_low ] as $currkey => $currval ) { if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) { $name = ''; $value = ''; $whole = ''; return false; } } } return true; } /* * Builds an attribute list from string containing attributes. * * This function does a lot of work. It parses an attribute list into an array * with attribute data, and tries to do the right thing even if it gets weird * input. It will add quotes around attribute values that don't have any quotes * or apostrophes around them, to make it easier to produce HTML code that will * conform to W3C's HTML specification. It will also remove bad URL protocols * from attribute values. It also reduces duplicate attributes by using the * attribute defined first (`foo='bar' foo='baz'` will result in `foo='bar'`). * * @since 1.0.0 * * @param string $attr Attribute list from HTML element to closing HTML element tag. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return array[] Array of attribute information after parsing. / function wp_kses_hair( $attr, $allowed_protocols ) { $attrarr = array(); $mode = 0; $attrname = ''; $uris = wp_kses_uri_attributes(); // Loop through the whole attribute list. while ( strlen( $attr ) != 0 ) { $working = 0; // Was the last operation successful? switch ( $mode ) { case 0: if ( preg_match( '/^([_a-zA-Z][-_a-zA-Z0-9:.])/', $attr, $match ) ) { $attrname = $match[1]; $working = 1; $mode = 1; $attr = preg_replace( '/^[_a-zA-Z][-_a-zA-Z0-9:.]/', '', $attr ); } break; case 1: if ( preg_match( '/^\s=\s/', $attr ) ) { // Equals sign. $working = 1; $mode = 2; $attr = preg_replace( '/^\s=\s/', '', $attr ); break; } if ( preg_match( '/^\s+/', $attr ) ) { // Valueless. $working = 1; $mode = 0; if ( false === array_key_exists( $attrname, $attrarr ) ) { $attrarr[ $attrname ] = array( 'name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y', ); } $attr = preg_replace( '/^\s+/', '', $attr ); } break; case 2: if ( preg_match( '%^"([^"])"(\s+\|/?$)%', $attr, $match ) ) { // "value" $thisval = $match[1]; if ( in_array( strtolower( $attrname ), $uris, true ) ) { $thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols ); } if ( false === array_key_exists( $attrname, $attrarr ) ) { $attrarr[ $attrname ] = array( 'name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n', ); } $working = 1; $mode = 0; $attr = preg_replace( '/^"[^"]"(\s+\|$)/', '', $attr ); break; } if ( preg_match( "%^'([^'])'(\s+\|/?$)%", $attr, $match ) ) { // 'value' $thisval = $match[1]; if ( in_array( strtolower( $attrname ), $uris, true ) ) { $thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols ); } if ( false === array_key_exists( $attrname, $attrarr ) ) { $attrarr[ $attrname ] = array( 'name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n', ); } $working = 1; $mode = 0; $attr = preg_replace( "/^'[^']'(\s+\|$)/", '', $attr ); break; } if ( preg_match( "%^([^\s\"']+)(\s+\|/?$)%", $attr, $match ) ) { // value $thisval = $match[1]; if ( in_array( strtolower( $attrname ), $uris, true ) ) { $thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols ); } if ( false === array_key_exists( $attrname, $attrarr ) ) { $attrarr[ $attrname ] = array( 'name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n', ); } // We add quotes to conform to W3C's HTML spec. $working = 1; $mode = 0; $attr = preg_replace( "%^[^\s\"']+(\s+\|$)%", '', $attr ); } break; } // End switch. if ( 0 == $working ) { // Not well-formed, remove and try again. $attr = wp_kses_html_error( $attr ); $mode = 0; } } // End while. if ( 1 == $mode && false === array_key_exists( $attrname, $attrarr ) ) { // Special case, for when the attribute list ends with a valueless // attribute like "selected". $attrarr[ $attrname ] = array( 'name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y', ); } return $attrarr; } /* * Finds all attributes of an HTML element. * * Does not modify input. May return "evil" output. * * Based on `wp_kses_split2()` and `wp_kses_attr()`. * * @since 4.2.3 * * @param string $element HTML element. * @return array\|bool List of attributes found in the element. Returns false on failure. / function wp_kses_attr_parse( $element ) { $valid = preg_match( '%^(<\s)(/\s)?([a-zA-Z0-9]+\s)([^>])(>?)$%', $element, $matches ); if ( 1 !== $valid ) { return false; } $begin = $matches[1]; $slash = $matches[2]; $elname = $matches[3]; $attr = $matches[4]; $end = $matches[5]; if ( '' !== $slash ) { // Closing elements do not get parsed. return false; } // Is there a closing XHTML slash at the end of the attributes? if ( 1 === preg_match( '%\s/\s$%', $attr, $matches ) ) { $xhtml_slash = $matches[0]; $attr = substr( $attr, 0, -strlen( $xhtml_slash ) ); } else { $xhtml_slash = ''; } // Split it. $attrarr = wp_kses_hair_parse( $attr ); if ( false === $attrarr ) { return false; } // Make sure all input is returned by adding front and back matter. array_unshift( $attrarr, $begin . $slash . $elname ); array_push( $attrarr, $xhtml_slash . $end ); return $attrarr; } /* * Builds an attribute list from string containing attributes. * * Does not modify input. May return "evil" output. * In case of unexpected input, returns false instead of stripping things. * * Based on `wp_kses_hair()` but does not return a multi-dimensional array. * * @since 4.2.3 * * @param string $attr Attribute list from HTML element to closing HTML element tag. * @return array\|bool List of attributes found in $attr. Returns false on failure. / function wp_kses_hair_parse( $attr ) { if ( '' === $attr ) { return array(); } // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation $regex = '(?:' . '[_a-zA-Z][-_a-zA-Z0-9:.]' // Attribute name. . '\|' . '\[\[?[^\[\]]+\]\]?' // Shortcode in the name position implies unfiltered_html. . ')' . '(?:' // Attribute value. . '\s=\s' // All values begin with '='. . '(?:' . '"[^"]"' // Double-quoted. . '\|' . "'[^']'" // Single-quoted. . '\|' . '[^\s"\']+' // Non-quoted. . '(?:\s\|$)' // Must have a space. . ')' . '\|' . '(?:\s\|$)' // If attribute has no value, space is required. . ')' . '\s'; // Trailing space is optional except as mentioned above. // phpcs:enable // Although it is possible to reduce this procedure to a single regexp, // we must run that regexp twice to get exactly the expected result. $validation = "%^($regex)+$%"; $extraction = "%$regex%"; if ( 1 === preg_match( $validation, $attr ) ) { preg_match_all( $extraction, $attr, $attrarr ); return $attrarr[0]; } else { return false; } } /* * Performs different checks for attribute values. * * The currently implemented checks are "maxlen", "minlen", "maxval", "minval", * and "valueless". * * @since 1.0.0 * * @param string $value Attribute value. * @param string $vless Whether the attribute is valueless. Use 'y' or 'n'. * @param string $checkname What $checkvalue is checking for. * @param mixed $checkvalue What constraint the value should pass. * @return bool Whether check passes. / function wp_kses_check_attr_val( $value, $vless, $checkname, $checkvalue ) { $ok = true; switch ( strtolower( $checkname ) ) { case 'maxlen': / * The maxlen check makes sure that the attribute value has a length not * greater than the given value. This can be used to avoid Buffer Overflows * in WWW clients and various Internet servers. / if ( strlen( $value ) > $checkvalue ) { $ok = false; } break; case 'minlen': / * The minlen check makes sure that the attribute value has a length not * smaller than the given value. / if ( strlen( $value ) < $checkvalue ) { $ok = false; } break; case 'maxval': / * The maxval check does two things: it checks that the attribute value is * an integer from 0 and up, without an excessive amount of zeroes or * whitespace (to avoid Buffer Overflows). It also checks that the attribute * value is not greater than the given value. * This check can be used to avoid Denial of Service attacks. / if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) { $ok = false; } if ( $value > $checkvalue ) { $ok = false; } break; case 'minval': / * The minval check makes sure that the attribute value is a positive integer, * and that it is not smaller than the given value. / if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) { $ok = false; } if ( $value < $checkvalue ) { $ok = false; } break; case 'valueless': / * The valueless check makes sure if the attribute has a value * (like `<a href="blah">`) or not (`<option selected>`). If the given value * is a "y" or a "Y", the attribute must not have a value. * If the given value is an "n" or an "N", the attribute must have a value. / if ( strtolower( $checkvalue ) != $vless ) { $ok = false; } break; } // End switch. return $ok; } /* * Sanitizes a string and removed disallowed URL protocols. * * This function removes all non-allowed protocols from the beginning of the * string. It ignores whitespace and the case of the letters, and it does * understand HTML entities. It does its work recursively, so it won't be * fooled by a string like `javascript:javascript:alert(57)`. * * @since 1.0.0 * * @param string $string Content to filter bad protocols from. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return string Filtered content. / function wp_kses_bad_protocol( $string, $allowed_protocols ) { $string = wp_kses_no_null( $string ); $iterations = 0; do { $original_string = $string; $string = wp_kses_bad_protocol_once( $string, $allowed_protocols ); } while ( $original_string != $string && ++$iterations < 6 ); if ( $original_string != $string ) { return ''; } return $string; } /* * Removes any invalid control characters in a text string. * * Also removes any instance of the `\0` string. * * @since 1.0.0 * * @param string $string Content to filter null characters from. * @param array $options Set 'slash_zero' => 'keep' when '\0' is allowed. Default is 'remove'. * @return string Filtered content. / function wp_kses_no_null( $string, $options = null ) { if ( ! isset( $options['slash_zero'] ) ) { $options = array( 'slash_zero' => 'remove' ); } $string = preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string ); if ( 'remove' === $options['slash_zero'] ) { $string = preg_replace( '/\\\\+0+/', '', $string ); } return $string; } /* * Strips slashes from in front of quotes. * * This function changes the character sequence `\"` to just `"`. It leaves all other * slashes alone. The quoting from `preg_replace(//e)` requires this. * * @since 1.0.0 * * @param string $string String to strip slashes from. * @return string Fixed string with quoted slashes. / function wp_kses_stripslashes( $string ) { return preg_replace( '%\\\\"%', '"', $string ); } /* * Converts the keys of an array to lowercase. * * @since 1.0.0 * * @param array $inarray Unfiltered array. * @return array Fixed array with all lowercase keys. / function wp_kses_array_lc( $inarray ) { $outarray = array(); foreach ( (array) $inarray as $inkey => $inval ) { $outkey = strtolower( $inkey ); $outarray[ $outkey ] = array(); foreach ( (array) $inval as $inkey2 => $inval2 ) { $outkey2 = strtolower( $inkey2 ); $outarray[ $outkey ][ $outkey2 ] = $inval2; } } return $outarray; } /* * Handles parsing errors in `wp_kses_hair()`. * * The general plan is to remove everything to and including some whitespace, * but it deals with quotes and apostrophes as well. * * @since 1.0.0 * * @param string $string * @return string / function wp_kses_html_error( $string ) { return preg_replace( '/^("[^"]("\|$)\|\'[^\'](\'\|$)\|\S)\s/', '', $string ); } /* * Sanitizes content from bad protocols and other characters. * * This function searches for URL protocols at the beginning of the string, while * handling whitespace and HTML entities. * * @since 1.0.0 * * @param string $string Content to check for bad protocols. * @param string[] $allowed_protocols Array of allowed URL protocols. * @param int $count Depth of call recursion to this function. * @return string Sanitized content. / function wp_kses_bad_protocol_once( $string, $allowed_protocols, $count = 1 ) { $string = preg_replace( '/(&#058(?![;0-9])\|&#x03a(?![;a-f0-9]))/i', '$1;', $string ); $string2 = preg_split( '/:\|&#058;\|&#x03a;\|&colon;/i', $string, 2 ); if ( isset( $string2[1] ) && ! preg_match( '%/\?%', $string2[0] ) ) { $string = trim( $string2[1] ); $protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols ); if ( 'feed:' === $protocol ) { if ( $count > 2 ) { return ''; } $string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count ); if ( empty( $string ) ) { return $string; } } $string = $protocol . $string; } return $string; } /* * Callback for `wp_kses_bad_protocol_once()` regular expression. * * This function processes URL protocols, checks to see if they're in the * list of allowed protocols or not, and returns different data depending * on the answer. * * @access private * @ignore * @since 1.0.0 * * @param string $string URI scheme to check against the list of allowed protocols. * @param string[] $allowed_protocols Array of allowed URL protocols. * @return string Sanitized content. / function wp_kses_bad_protocol_once2( $string, $allowed_protocols ) { $string2 = wp_kses_decode_entities( $string ); $string2 = preg_replace( '/\s/', '', $string2 ); $string2 = wp_kses_no_null( $string2 ); $string2 = strtolower( $string2 ); $allowed = false; foreach ( (array) $allowed_protocols as $one_protocol ) { if ( strtolower( $one_protocol ) == $string2 ) { $allowed = true; break; } } if ( $allowed ) { return "$string2:"; } else { return ''; } } /* * Converts and fixes HTML entities. * * This function normalizes HTML entities. It will convert `AT&T` to the correct * `AT&T`, `:` to `:`, `&#XYZZY;` to `&#XYZZY;` and so on. * * When `$context` is set to 'xml', HTML entities are converted to their code points. For * example, `AT&T…&#XYZZY;` is converted to `AT&T…&#XYZZY;`. * * @since 1.0.0 * @since 5.5.0 Added `$context` parameter. * * @param string $string Content to normalize entities. * @param string $context Context for normalization. Can be either 'html' or 'xml'. * Default 'html'. * @return string Content with normalized entities. / function wp_kses_normalize_entities( $string, $context = 'html' ) { // Disarm all entities by converting & to & $string = str_replace( '&', '&', $string ); // Change back the allowed entities in our list of allowed entities. if ( 'xml' === $context ) { $string = preg_replace_callback( '/&([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_xml_named_entities', $string ); } else { $string = preg_replace_callback( '/&([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $string ); } $string = preg_replace_callback( '/&#(0[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string ); $string = preg_replace_callback( '/&#[Xx](0[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $string ); return $string; } /* * Callback for `wp_kses_normalize_entities()` regular expression. * * This function only accepts valid named entity references, which are finite, * case-sensitive, and highly scrutinized by HTML and XML validators. * * @since 3.0.0 * * @global array $allowedentitynames * * @param array $matches preg_replace_callback() matches array. * @return string Correctly encoded entity. / function wp_kses_named_entities( $matches ) { global $allowedentitynames; if ( empty( $matches[1] ) ) { return ''; } $i = $matches[1]; return ( ! in_array( $i, $allowedentitynames, true ) ) ? "&$i;" : "&$i;"; } /* * Callback for `wp_kses_normalize_entities()` regular expression. * * This function only accepts valid named entity references, which are finite, * case-sensitive, and highly scrutinized by XML validators. HTML named entity * references are converted to their code points. * * @since 5.5.0 * * @global array $allowedentitynames * @global array $allowedxmlnamedentities * * @param array $matches preg_replace_callback() matches array. * @return string Correctly encoded entity. / function wp_kses_xml_named_entities( $matches ) { global $allowedentitynames, $allowedxmlnamedentities; if ( empty( $matches[1] ) ) { return ''; } $i = $matches[1]; if ( in_array( $i, $allowedxmlnamedentities, true ) ) { return "&$i;"; } elseif ( in_array( $i, $allowedentitynames, true ) ) { return html_entity_decode( "&$i;", ENT_HTML5 ); } return "&$i;"; } /* * Callback for `wp_kses_normalize_entities()` regular expression. * * This function helps `wp_kses_normalize_entities()` to only accept 16-bit * values and nothing more for `&#number;` entities. * * @access private * @ignore * @since 1.0.0 * * @param array $matches `preg_replace_callback()` matches array. * @return string Correctly encoded entity. / function wp_kses_normalize_entities2( $matches ) { if ( empty( $matches[1] ) ) { return ''; } $i = $matches[1]; if ( valid_unicode( $i ) ) { $i = str_pad( ltrim( $i, '0' ), 3, '0', STR_PAD_LEFT ); $i = "&#$i;"; } else { $i = "&#$i;"; } return $i; } /* * Callback for `wp_kses_normalize_entities()` for regular expression. * * This function helps `wp_kses_normalize_entities()` to only accept valid Unicode * numeric entities in hex form. * * @since 2.7.0 * @access private * @ignore * * @param array $matches `preg_replace_callback()` matches array. * @return string Correctly encoded entity. / function wp_kses_normalize_entities3( $matches ) { if ( empty( $matches[1] ) ) { return ''; } $hexchars = $matches[1]; return ( ! valid_unicode( hexdec( $hexchars ) ) ) ? "&#x$hexchars;" : '&#x' . ltrim( $hexchars, '0' ) . ';'; } /* * Determines if a Unicode codepoint is valid. * * @since 2.7.0 * * @param int $i Unicode codepoint. * @return bool Whether or not the codepoint is a valid Unicode codepoint. / function valid_unicode( $i ) { return ( 0x9 == $i \|\| 0xa == $i \|\| 0xd == $i \|\| ( 0x20 <= $i && $i <= 0xd7ff ) \|\| ( 0xe000 <= $i && $i <= 0xfffd ) \|\| ( 0x10000 <= $i && $i <= 0x10ffff ) ); } /* * Converts all numeric HTML entities to their named counterparts. * * This function decodes numeric HTML entities (`A` and `A`). * It doesn't do anything with named entities like `ä`, but we don't * need them in the allowed URL protocols system anyway. * * @since 1.0.0 * * @param string $string Content to change entities. * @return string Content after decoded entities. / function wp_kses_decode_entities( $string ) { $string = preg_replace_callback( '/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string ); $string = preg_replace_callback( '/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string ); return $string; } /* * Regex callback for `wp_kses_decode_entities()`. * * @since 2.9.0 * @access private * @ignore * * @param array $match preg match * @return string / function _wp_kses_decode_entities_chr( $match ) { return chr( $match[1] ); } /* * Regex callback for `wp_kses_decode_entities()`. * * @since 2.9.0 * @access private * @ignore * * @param array $match preg match * @return string / function _wp_kses_decode_entities_chr_hexdec( $match ) { return chr( hexdec( $match[1] ) ); } /* * Sanitize content with allowed HTML KSES rules. * * This function expects slashed data. * * @since 1.0.0 * * @param string $data Content to filter, expected to be escaped with slashes. * @return string Filtered content. / function wp_filter_kses( $data ) { return addslashes( wp_kses( stripslashes( $data ), current_filter() ) ); } /* * Sanitize content with allowed HTML KSES rules. * * This function expects unslashed data. * * @since 2.9.0 * * @param string $data Content to filter, expected to not be escaped. * @return string Filtered content. / function wp_kses_data( $data ) { return wp_kses( $data, current_filter() ); } /* * Sanitizes content for allowed HTML tags for post content. * * Post content refers to the page contents of the 'post' type and not `$_POST` * data from forms. * * This function expects slashed data. * * @since 2.0.0 * * @param string $data Post content to filter, expected to be escaped with slashes. * @return string Filtered post content with allowed HTML tags and attributes intact. / function wp_filter_post_kses( $data ) { return addslashes( wp_kses( stripslashes( $data ), 'post' ) ); } /* * Sanitizes content for allowed HTML tags for post content. * * Post content refers to the page contents of the 'post' type and not `$_POST` * data from forms. * * This function expects unslashed data. * * @since 2.9.0 * * @param string $data Post content to filter. * @return string Filtered post content with allowed HTML tags and attributes intact. / function wp_kses_post( $data ) { return wp_kses( $data, 'post' ); } /* * Navigates through an array, object, or scalar, and sanitizes content for * allowed HTML tags for post content. * * @since 4.4.2 * * @see map_deep() * * @param mixed $data The array, object, or scalar value to inspect. * @return mixed The filtered content. / function wp_kses_post_deep( $data ) { return map_deep( $data, 'wp_kses_post' ); } /* * Strips all HTML from a text string. * * This function expects slashed data. * * @since 2.1.0 * * @param string $data Content to strip all HTML from. * @return string Filtered content without any HTML. / function wp_filter_nohtml_kses( $data ) { return addslashes( wp_kses( stripslashes( $data ), 'strip' ) ); } /* * Adds all KSES input form content filters. * * All hooks have default priority. The `wp_filter_kses()` function is added to * the 'pre_comment_content' and 'title_save_pre' hooks. * * The `wp_filter_post_kses()` function is added to the 'content_save_pre', * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks. * * @since 2.0.0 / function kses_init_filters() { // Normal filtering. add_filter( 'title_save_pre', 'wp_filter_kses' ); // Comment filtering. if ( current_user_can( 'unfiltered_html' ) ) { add_filter( 'pre_comment_content', 'wp_filter_post_kses' ); } else { add_filter( 'pre_comment_content', 'wp_filter_kses' ); } // Post filtering. add_filter( 'content_save_pre', 'wp_filter_post_kses' ); add_filter( 'excerpt_save_pre', 'wp_filter_post_kses' ); add_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ); } /* * Removes all KSES input form content filters. * * A quick procedural method to removing all of the filters that KSES uses for * content in WordPress Loop. * * Does not remove the `kses_init()` function from {@see 'init'} hook (priority is * default). Also does not remove `kses_init()` function from {@see 'set_current_user'} * hook (priority is also default). * * @since 2.0.6 / function kses_remove_filters() { // Normal filtering. remove_filter( 'title_save_pre', 'wp_filter_kses' ); // Comment filtering. remove_filter( 'pre_comment_content', 'wp_filter_post_kses' ); remove_filter( 'pre_comment_content', 'wp_filter_kses' ); // Post filtering. remove_filter( 'content_save_pre', 'wp_filter_post_kses' ); remove_filter( 'excerpt_save_pre', 'wp_filter_post_kses' ); remove_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ); } /* * Sets up most of the KSES filters for input form content. * * First removes all of the KSES filters in case the current user does not need * to have KSES filter the content. If the user does not have `unfiltered_html` * capability, then KSES filters are added. * * @since 2.0.0 / function kses_init() { kses_remove_filters(); if ( ! current_user_can( 'unfiltered_html' ) ) { kses_init_filters(); } } /* * Filters an inline style attribute and removes disallowed rules. * * @since 2.8.1 * * @param string $css A string of CSS rules. * @param string $deprecated Not used. * @return string Filtered string of CSS rules. / function safecss_filter_attr( $css, $deprecated = '' ) { if ( ! empty( $deprecated ) ) { _deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented. } $css = wp_kses_no_null( $css ); $css = str_replace( array( "\n", "\r", "\t" ), '', $css ); $allowed_protocols = wp_allowed_protocols(); $css_array = explode( ';', trim( $css ) ); /* * Filters list of allowed CSS attributes. * * @since 2.8.1 * @since 4.4.0 Added support for `min-height`, `max-height`, `min-width`, and `max-width`. * @since 4.6.0 Added support for `list-style-type`. * @since 5.0.0 Added support for `background-image`. * @since 5.1.0 Added support for `text-transform`. * @since 5.2.0 Added support for `background-position` and `grid-template-columns`. * @since 5.3.0 Added support for `grid`, `flex` and `column` layout properties. * Extend `background-` support of individual properties. @since 5.3.1 Added support for gradient backgrounds. * * @param string[] $attr Array of allowed CSS attributes. / $allowed_attr = apply_filters( 'safe_style_css', array( 'background', 'background-color', 'background-image', 'background-position', 'background-size', 'background-attachment', 'background-blend-mode', 'border', 'border-radius', 'border-width', 'border-color', 'border-style', 'border-right', 'border-right-color', 'border-right-style', 'border-right-width', 'border-bottom', 'border-bottom-color', 'border-bottom-style', 'border-bottom-width', 'border-left', 'border-left-color', 'border-left-style', 'border-left-width', 'border-top', 'border-top-color', 'border-top-style', 'border-top-width', 'border-spacing', 'border-collapse', 'caption-side', 'columns', 'column-count', 'column-fill', 'column-gap', 'column-rule', 'column-span', 'column-width', 'color', 'font', 'font-family', 'font-size', 'font-style', 'font-variant', 'font-weight', 'letter-spacing', 'line-height', 'text-align', 'text-decoration', 'text-indent', 'text-transform', 'height', 'min-height', 'max-height', 'width', 'min-width', 'max-width', 'margin', 'margin-right', 'margin-bottom', 'margin-left', 'margin-top', 'padding', 'padding-right', 'padding-bottom', 'padding-left', 'padding-top', 'flex', 'flex-basis', 'flex-direction', 'flex-flow', 'flex-grow', 'flex-shrink', 'grid-template-columns', 'grid-auto-columns', 'grid-column-start', 'grid-column-end', 'grid-column-gap', 'grid-template-rows', 'grid-auto-rows', 'grid-row-start', 'grid-row-end', 'grid-row-gap', 'grid-gap', 'justify-content', 'justify-items', 'justify-self', 'align-content', 'align-items', 'align-self', 'clear', 'cursor', 'direction', 'float', 'list-style-type', 'overflow', 'vertical-align', ) ); / * CSS attributes that accept URL data types. * * This is in accordance to the CSS spec and unrelated to * the sub-set of supported attributes above. * * See: https://developer.mozilla.org/en-US/docs/Web/CSS/url / $css_url_data_types = array( 'background', 'background-image', 'cursor', 'list-style', 'list-style-image', ); / * CSS attributes that accept gradient data types. * / $css_gradient_data_types = array( 'background', 'background-image', ); if ( empty( $allowed_attr ) ) { return $css; } $css = ''; foreach ( $css_array as $css_item ) { if ( '' === $css_item ) { continue; } $css_item = trim( $css_item ); $css_test_string = $css_item; $found = false; $url_attr = false; $gradient_attr = false; if ( strpos( $css_item, ':' ) === false ) { $found = true; } else { $parts = explode( ':', $css_item, 2 ); $css_selector = trim( $parts[0] ); if ( in_array( $css_selector, $allowed_attr, true ) ) { $found = true; $url_attr = in_array( $css_selector, $css_url_data_types, true ); $gradient_attr = in_array( $css_selector, $css_gradient_data_types, true ); } } if ( $found && $url_attr ) { // Simplified: matches the sequence `url()`. preg_match_all( '/url\([^)]+\)/', $parts[1], $url_matches ); foreach ( $url_matches[0] as $url_match ) { // Clean up the URL from each of the matches above. preg_match( '/^url\(\s([\'\"]?)(.)(\g1)\s\)$/', $url_match, $url_pieces ); if ( empty( $url_pieces[2] ) ) { $found = false; break; } $url = trim( $url_pieces[2] ); if ( empty( $url ) \|\| wp_kses_bad_protocol( $url, $allowed_protocols ) !== $url ) { $found = false; break; } else { // Remove the whole `url()` bit that was matched above from the CSS. $css_test_string = str_replace( $url_match, '', $css_test_string ); } } } if ( $found && $gradient_attr ) { $css_value = trim( $parts[1] ); if ( preg_match( '/^(repeating-)?(linear\|radial\|conic)-gradient\(([^()]\|rgb[a]?\([^()]\))\)$/', $css_value ) ) { // Remove the whole `gradient` bit that was matched above from the CSS. $css_test_string = str_replace( $css_value, '', $css_test_string ); } } if ( $found ) { // Check for any CSS containing \ ( & } = or comments, except for url() usage checked above. $allow_css = ! preg_match( '%[\\\(&=}]\|/\%', $css_test_string ); /* * Filters the check for unsafe CSS in `safecss_filter_attr`. * * Enables developers to determine whether a section of CSS should be allowed or discarded. * By default, the value will be false if the part contains \ ( & } = or comments. * Return true to allow the CSS part to be included in the output. * * @since 5.5.0 * * @param bool $allow_css Whether the CSS in the test string is considered safe. * @param string $css_test_string The CSS string to test. / $allow_css = apply_filters( 'safecss_filter_attr_allow_css', $allow_css, $css_test_string ); // Only add the CSS part if it passes the regex check. if ( $allow_css ) { if ( '' !== $css ) { $css .= ';'; } $css .= $css_item; } } } return $css; } /* * Helper function to add global attributes to a tag in the allowed HTML list. * * @since 3.5.0 * @since 5.0.0 Add support for `data-` wildcard attributes. @access private * @ignore * * @param array $value An array of attributes. * @return array The array of attributes with global attributes added. / function _wp_add_global_attributes( $value ) { $global_attributes = array( 'aria-describedby' => true, 'aria-details' => true, 'aria-label' => true, 'aria-labelledby' => true, 'aria-hidden' => true, 'class' => true, 'id' => true, 'style' => true, 'title' => true, 'role' => true, 'data-' => true, ); if ( true === $value ) { $value = array(); } if ( is_array( $value ) ) { return array_merge( $value, $global_attributes ); } return $value; } Back

Edit File : kses.php | Size : 61.88 KB

<?php
/**
 * kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes
 * Copyright (C) 2002, 2003, 2005  Ulf Harnhammar
 *
 * This program is free software and open source software; you can redistribute
 * it and/or modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 * http://www.gnu.org/licenses/gpl.html
 *
 * [kses strips evil scripts!]
 *
 * Added wp_ prefix to avoid conflicts with existing kses users
 *
 * @version 0.2.2
 * @copyright (C) 2002, 2003, 2005
 * @author Ulf Harnhammar <http://advogato.org/person/metaur/>
 *
 * @package External
 * @subpackage KSES
 */

/**
 * Specifies the default allowable HTML tags.
 *
 * Using `CUSTOM_TAGS` is not recommended and should be considered deprecated. The
 * {@see 'wp_kses_allowed_html'} filter is more powerful and supplies context.
 *
 * @see wp_kses_allowed_html()
 * @since 1.2.0
 *
 * @var array[]|bool Array of default allowable HTML tags, or false to use the defaults.
 */
if ( ! defined( 'CUSTOM_TAGS' ) ) {
	define( 'CUSTOM_TAGS', false );
}

// Ensure that these variables are added to the global namespace
// (e.g. if using namespaces / autoload in the current PHP environment).
global $allowedposttags, $allowedtags, $allowedentitynames, $allowedxmlentitynames;

if ( ! CUSTOM_TAGS ) {
	/**
	 * KSES global for default allowable HTML tags.
	 *
	 * Can be overridden with the `CUSTOM_TAGS` constant.
	 *
	 * @var array[] $allowedposttags Array of default allowable HTML tags.
	 * @since 2.0.0
	 */
	$allowedposttags = array(
		'address'    => array(),
		'a'          => array(
			'href'     => true,
			'rel'      => true,
			'rev'      => true,
			'name'     => true,
			'target'   => true,
			'download' => array(
				'valueless' => 'y',
			),
		),
		'abbr'       => array(),
		'acronym'    => array(),
		'area'       => array(
			'alt'    => true,
			'coords' => true,
			'href'   => true,
			'nohref' => true,
			'shape'  => true,
			'target' => true,
		),
		'article'    => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'aside'      => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'audio'      => array(
			'autoplay' => true,
			'controls' => true,
			'loop'     => true,
			'muted'    => true,
			'preload'  => true,
			'src'      => true,
		),
		'b'          => array(),
		'bdo'        => array(
			'dir' => true,
		),
		'big'        => array(),
		'blockquote' => array(
			'cite'     => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'br'         => array(),
		'button'     => array(
			'disabled' => true,
			'name'     => true,
			'type'     => true,
			'value'    => true,
		),
		'caption'    => array(
			'align' => true,
		),
		'cite'       => array(
			'dir'  => true,
			'lang' => true,
		),
		'code'       => array(),
		'col'        => array(
			'align'   => true,
			'char'    => true,
			'charoff' => true,
			'span'    => true,
			'dir'     => true,
			'valign'  => true,
			'width'   => true,
		),
		'colgroup'   => array(
			'align'   => true,
			'char'    => true,
			'charoff' => true,
			'span'    => true,
			'valign'  => true,
			'width'   => true,
		),
		'del'        => array(
			'datetime' => true,
		),
		'dd'         => array(),
		'dfn'        => array(),
		'details'    => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'open'     => true,
			'xml:lang' => true,
		),
		'div'        => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'dl'         => array(),
		'dt'         => array(),
		'em'         => array(),
		'fieldset'   => array(),
		'figure'     => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'figcaption' => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'font'       => array(
			'color' => true,
			'face'  => true,
			'size'  => true,
		),
		'footer'     => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'h1'         => array(
			'align' => true,
		),
		'h2'         => array(
			'align' => true,
		),
		'h3'         => array(
			'align' => true,
		),
		'h4'         => array(
			'align' => true,
		),
		'h5'         => array(
			'align' => true,
		),
		'h6'         => array(
			'align' => true,
		),
		'header'     => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'hgroup'     => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'hr'         => array(
			'align'   => true,
			'noshade' => true,
			'size'    => true,
			'width'   => true,
		),
		'i'          => array(),
		'img'        => array(
			'alt'      => true,
			'align'    => true,
			'border'   => true,
			'height'   => true,
			'hspace'   => true,
			'loading'  => true,
			'longdesc' => true,
			'vspace'   => true,
			'src'      => true,
			'usemap'   => true,
			'width'    => true,
		),
		'ins'        => array(
			'datetime' => true,
			'cite'     => true,
		),
		'kbd'        => array(),
		'label'      => array(
			'for' => true,
		),
		'legend'     => array(
			'align' => true,
		),
		'li'         => array(
			'align' => true,
			'value' => true,
		),
		'map'        => array(
			'name' => true,
		),
		'mark'       => array(),
		'menu'       => array(
			'type' => true,
		),
		'nav'        => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'p'          => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'pre'        => array(
			'width' => true,
		),
		'q'          => array(
			'cite' => true,
		),
		's'          => array(),
		'samp'       => array(),
		'span'       => array(
			'dir'      => true,
			'align'    => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'section'    => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'small'      => array(),
		'strike'     => array(),
		'strong'     => array(),
		'sub'        => array(),
		'summary'    => array(
			'align'    => true,
			'dir'      => true,
			'lang'     => true,
			'xml:lang' => true,
		),
		'sup'        => array(),
		'table'      => array(
			'align'       => true,
			'bgcolor'     => true,
			'border'      => true,
			'cellpadding' => true,
			'cellspacing' => true,
			'dir'         => true,
			'rules'       => true,
			'summary'     => true,
			'width'       => true,
		),
		'tbody'      => array(
			'align'   => true,
			'char'    => true,
			'charoff' => true,
			'valign'  => true,
		),
		'td'         => array(
			'abbr'    => true,
			'align'   => true,
			'axis'    => true,
			'bgcolor' => true,
			'char'    => true,
			'charoff' => true,
			'colspan' => true,
			'dir'     => true,
			'headers' => true,
			'height'  => true,
			'nowrap'  => true,
			'rowspan' => true,
			'scope'   => true,
			'valign'  => true,
			'width'   => true,
		),
		'textarea'   => array(
			'cols'     => true,
			'rows'     => true,
			'disabled' => true,
			'name'     => true,
			'readonly' => true,
		),
		'tfoot'      => array(
			'align'   => true,
			'char'    => true,
			'charoff' => true,
			'valign'  => true,
		),
		'th'         => array(
			'abbr'    => true,
			'align'   => true,
			'axis'    => true,
			'bgcolor' => true,
			'char'    => true,
			'charoff' => true,
			'colspan' => true,
			'headers' => true,
			'height'  => true,
			'nowrap'  => true,
			'rowspan' => true,
			'scope'   => true,
			'valign'  => true,
			'width'   => true,
		),
		'thead'      => array(
			'align'   => true,
			'char'    => true,
			'charoff' => true,
			'valign'  => true,
		),
		'title'      => array(),
		'tr'         => array(
			'align'   => true,
			'bgcolor' => true,
			'char'    => true,
			'charoff' => true,
			'valign'  => true,
		),
		'track'      => array(
			'default' => true,
			'kind'    => true,
			'label'   => true,
			'src'     => true,
			'srclang' => true,
		),
		'tt'         => array(),
		'u'          => array(),
		'ul'         => array(
			'type' => true,
		),
		'ol'         => array(
			'start'    => true,
			'type'     => true,
			'reversed' => true,
		),
		'var'        => array(),
		'video'      => array(
			'autoplay'    => true,
			'controls'    => true,
			'height'      => true,
			'loop'        => true,
			'muted'       => true,
			'playsinline' => true,
			'poster'      => true,
			'preload'     => true,
			'src'         => true,
			'width'       => true,
		),
	);

/**
	 * @var array[] $allowedtags Array of KSES allowed HTML elements.
	 * @since 1.0.0
	 */
	$allowedtags = array(
		'a'          => array(
			'href'  => true,
			'title' => true,
		),
		'abbr'       => array(
			'title' => true,
		),
		'acronym'    => array(
			'title' => true,
		),
		'b'          => array(),
		'blockquote' => array(
			'cite' => true,
		),
		'cite'       => array(),
		'code'       => array(),
		'del'        => array(
			'datetime' => true,
		),
		'em'         => array(),
		'i'          => array(),
		'q'          => array(
			'cite' => true,
		),
		's'          => array(),
		'strike'     => array(),
		'strong'     => array(),
	);

/**
	 * @var string[] $allowedentitynames Array of KSES allowed HTML entitity names.
	 * @since 1.0.0
	 */
	$allowedentitynames = array(
		'nbsp',
		'iexcl',
		'cent',
		'pound',
		'curren',
		'yen',
		'brvbar',
		'sect',
		'uml',
		'copy',
		'ordf',
		'laquo',
		'not',
		'shy',
		'reg',
		'macr',
		'deg',
		'plusmn',
		'acute',
		'micro',
		'para',
		'middot',
		'cedil',
		'ordm',
		'raquo',
		'iquest',
		'Agrave',
		'Aacute',
		'Acirc',
		'Atilde',
		'Auml',
		'Aring',
		'AElig',
		'Ccedil',
		'Egrave',
		'Eacute',
		'Ecirc',
		'Euml',
		'Igrave',
		'Iacute',
		'Icirc',
		'Iuml',
		'ETH',
		'Ntilde',
		'Ograve',
		'Oacute',
		'Ocirc',
		'Otilde',
		'Ouml',
		'times',
		'Oslash',
		'Ugrave',
		'Uacute',
		'Ucirc',
		'Uuml',
		'Yacute',
		'THORN',
		'szlig',
		'agrave',
		'aacute',
		'acirc',
		'atilde',
		'auml',
		'aring',
		'aelig',
		'ccedil',
		'egrave',
		'eacute',
		'ecirc',
		'euml',
		'igrave',
		'iacute',
		'icirc',
		'iuml',
		'eth',
		'ntilde',
		'ograve',
		'oacute',
		'ocirc',
		'otilde',
		'ouml',
		'divide',
		'oslash',
		'ugrave',
		'uacute',
		'ucirc',
		'uuml',
		'yacute',
		'thorn',
		'yuml',
		'quot',
		'amp',
		'lt',
		'gt',
		'apos',
		'OElig',
		'oelig',
		'Scaron',
		'scaron',
		'Yuml',
		'circ',
		'tilde',
		'ensp',
		'emsp',
		'thinsp',
		'zwnj',
		'zwj',
		'lrm',
		'rlm',
		'ndash',
		'mdash',
		'lsquo',
		'rsquo',
		'sbquo',
		'ldquo',
		'rdquo',
		'bdquo',
		'dagger',
		'Dagger',
		'permil',
		'lsaquo',
		'rsaquo',
		'euro',
		'fnof',
		'Alpha',
		'Beta',
		'Gamma',
		'Delta',
		'Epsilon',
		'Zeta',
		'Eta',
		'Theta',
		'Iota',
		'Kappa',
		'Lambda',
		'Mu',
		'Nu',
		'Xi',
		'Omicron',
		'Pi',
		'Rho',
		'Sigma',
		'Tau',
		'Upsilon',
		'Phi',
		'Chi',
		'Psi',
		'Omega',
		'alpha',
		'beta',
		'gamma',
		'delta',
		'epsilon',
		'zeta',
		'eta',
		'theta',
		'iota',
		'kappa',
		'lambda',
		'mu',
		'nu',
		'xi',
		'omicron',
		'pi',
		'rho',
		'sigmaf',
		'sigma',
		'tau',
		'upsilon',
		'phi',
		'chi',
		'psi',
		'omega',
		'thetasym',
		'upsih',
		'piv',
		'bull',
		'hellip',
		'prime',
		'Prime',
		'oline',
		'frasl',
		'weierp',
		'image',
		'real',
		'trade',
		'alefsym',
		'larr',
		'uarr',
		'rarr',
		'darr',
		'harr',
		'crarr',
		'lArr',
		'uArr',
		'rArr',
		'dArr',
		'hArr',
		'forall',
		'part',
		'exist',
		'empty',
		'nabla',
		'isin',
		'notin',
		'ni',
		'prod',
		'sum',
		'minus',
		'lowast',
		'radic',
		'prop',
		'infin',
		'ang',
		'and',
		'or',
		'cap',
		'cup',
		'int',
		'sim',
		'cong',
		'asymp',
		'ne',
		'equiv',
		'le',
		'ge',
		'sub',
		'sup',
		'nsub',
		'sube',
		'supe',
		'oplus',
		'otimes',
		'perp',
		'sdot',
		'lceil',
		'rceil',
		'lfloor',
		'rfloor',
		'lang',
		'rang',
		'loz',
		'spades',
		'clubs',
		'hearts',
		'diams',
		'sup1',
		'sup2',
		'sup3',
		'frac14',
		'frac12',
		'frac34',
		'there4',
	);

/**
	 * @var string[] $allowedxmlentitynames Array of KSES allowed XML entitity names.
	 * @since 5.5.0
	 */
	$allowedxmlnamedentities = array(
		'amp',
		'lt',
		'gt',
		'apos',
		'quot',
	);

$allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags );
} else {
	$allowedtags     = wp_kses_array_lc( $allowedtags );
	$allowedposttags = wp_kses_array_lc( $allowedposttags );
}

/**
 * Filters text content and strips out disallowed HTML.
 *
 * This function makes sure that only the allowed HTML element names, attribute
 * names, attribute values, and HTML entities will occur in the given text string.
 *
 * This function expects unslashed data.
 *
 * @see wp_kses_post() for specifically filtering post content and fields.
 * @see wp_allowed_protocols() for the default allowed protocols in link URLs.
 *
 * @since 1.0.0
 *
 * @param string         $string            Text content to filter.
 * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
 *                                          or a context name such as 'post'. See wp_kses_allowed_html()
 *                                          for the list of accepted context names.
 * @param string[]       $allowed_protocols Array of allowed URL protocols.
 * @return string Filtered content containing only the allowed HTML.
 */
function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) {
	if ( empty( $allowed_protocols ) ) {
		$allowed_protocols = wp_allowed_protocols();
	}

$string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );
	$string = wp_kses_normalize_entities( $string );
	$string = wp_kses_hook( $string, $allowed_html, $allowed_protocols );

return wp_kses_split( $string, $allowed_html, $allowed_protocols );
}

/**
 * Filters one HTML attribute and ensures its value is allowed.
 *
 * This function can escape data in some situations where `wp_kses()` must strip the whole attribute.
 *
 * @since 4.2.3
 *
 * @param string $string  The 'whole' attribute, including name and value.
 * @param string $element The HTML element name to which the attribute belongs.
 * @return string Filtered attribute.
 */
function wp_kses_one_attr( $string, $element ) {
	$uris              = wp_kses_uri_attributes();
	$allowed_html      = wp_kses_allowed_html( 'post' );
	$allowed_protocols = wp_allowed_protocols();
	$string            = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );

// Preserve leading and trailing whitespace.
	$matches = array();
	preg_match( '/^\s*/', $string, $matches );
	$lead = $matches[0];
	preg_match( '/\s*$/', $string, $matches );
	$trail = $matches[0];
	if ( empty( $trail ) ) {
		$string = substr( $string, strlen( $lead ) );
	} else {
		$string = substr( $string, strlen( $lead ), -strlen( $trail ) );
	}

// Parse attribute name and value from input.
	$split = preg_split( '/\s*=\s*/', $string, 2 );
	$name  = $split[0];
	if ( count( $split ) == 2 ) {
		$value = $split[1];

// Remove quotes surrounding $value.
		// Also guarantee correct quoting in $string for this one attribute.
		if ( '' === $value ) {
			$quote = '';
		} else {
			$quote = $value[0];
		}
		if ( '"' === $quote || "'" === $quote ) {
			if ( substr( $value, -1 ) != $quote ) {
				return '';
			}
			$value = substr( $value, 1, -1 );
		} else {
			$quote = '"';
		}

// Sanitize quotes, angle braces, and entities.
		$value = esc_attr( $value );

// Sanitize URI values.
		if ( in_array( strtolower( $name ), $uris, true ) ) {
			$value = wp_kses_bad_protocol( $value, $allowed_protocols );
		}

$string = "$name=$quote$value$quote";
		$vless  = 'n';
	} else {
		$value = '';
		$vless = 'y';
	}

// Sanitize attribute by name.
	wp_kses_attr_check( $name, $value, $string, $vless, $element, $allowed_html );

// Restore whitespace.
	return $lead . $string . $trail;
}

/**
 * Returns an array of allowed HTML tags and attributes for a given context.
 *
 * @since 3.5.0
 * @since 5.0.1 `form` removed as allowable HTML tag.
 *
 * @global array $allowedposttags
 * @global array $allowedtags
 * @global array $allowedentitynames
 *
 * @param string|array $context The context for which to retrieve tags. Allowed values are 'post',
 *                              'strip', 'data', 'entities', or the name of a field filter such as
 *                              'pre_user_description'.
 * @return array Array of allowed HTML tags and their allowed attributes.
 */
function wp_kses_allowed_html( $context = '' ) {
	global $allowedposttags, $allowedtags, $allowedentitynames;

if ( is_array( $context ) ) {
		/**
		 * Filters the HTML that is allowed for a given context.
		 *
		 * @since 3.5.0
		 *
		 * @param array[]|string $context      Context to judge allowed tags by.
		 * @param string         $context_type Context name.
		 */
		return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' );
	}

switch ( $context ) {
		case 'post':
			/** This filter is documented in wp-includes/kses.php */
			$tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );

// 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`.
			if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) {
				$tags = $allowedposttags;

$tags['form'] = array(
					'action'         => true,
					'accept'         => true,
					'accept-charset' => true,
					'enctype'        => true,
					'method'         => true,
					'name'           => true,
					'target'         => true,
				);

/** This filter is documented in wp-includes/kses.php */
				$tags = apply_filters( 'wp_kses_allowed_html', $tags, $context );
			}

return $tags;

case 'user_description':
		case 'pre_user_description':
			$tags             = $allowedtags;
			$tags['a']['rel'] = true;
			/** This filter is documented in wp-includes/kses.php */
			return apply_filters( 'wp_kses_allowed_html', $tags, $context );

case 'strip':
			/** This filter is documented in wp-includes/kses.php */
			return apply_filters( 'wp_kses_allowed_html', array(), $context );

case 'entities':
			/** This filter is documented in wp-includes/kses.php */
			return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context );

case 'data':
		default:
			/** This filter is documented in wp-includes/kses.php */
			return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context );
	}
}

/**
 * You add any KSES hooks here.
 *
 * There is currently only one KSES WordPress hook, {@see 'pre_kses'}, and it is called here.
 * All parameters are passed to the hooks and expected to receive a string.
 *
 * @since 1.0.0
 *
 * @param string         $string            Content to filter through KSES.
 * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
 *                                          or a context name such as 'post'. See wp_kses_allowed_html()
 *                                          for the list of accepted context names.
 * @param string[]       $allowed_protocols Array of allowed URL protocols.
 * @return string Filtered content through {@see 'pre_kses'} hook.
 */
function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) {
	/**
	 * Filters content to be run through KSES.
	 *
	 * @since 2.3.0
	 *
	 * @param string         $string            Content to filter through KSES.
	 * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
	 *                                          or a context name such as 'post'. See wp_kses_allowed_html()
	 *                                          for the list of accepted context names.
	 * @param string[]       $allowed_protocols Array of allowed URL protocols.
	 */
	return apply_filters( 'pre_kses', $string, $allowed_html, $allowed_protocols );
}

/**
 * Returns the version number of KSES.
 *
 * @since 1.0.0
 *
 * @return string KSES version number.
 */
function wp_kses_version() {
	return '0.2.2';
}

/**
 * Searches for HTML tags, no matter how malformed.
 *
 * It also matches stray `>` characters.
 *
 * @since 1.0.0
 *
 * @global array[]|string $pass_allowed_html      An array of allowed HTML elements and attributes,
 *                                                or a context name such as 'post'.
 * @global string[]       $pass_allowed_protocols Array of allowed URL protocols.
 *
 * @param string         $string            Content to filter.
 * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
 *                                          or a context name such as 'post'. See wp_kses_allowed_html()
 *                                          for the list of accepted context names.
 * @param string[]       $allowed_protocols Array of allowed URL protocols.
 * @return string Content with fixed HTML tags
 */
function wp_kses_split( $string, $allowed_html, $allowed_protocols ) {
	global $pass_allowed_html, $pass_allowed_protocols;

$pass_allowed_html      = $allowed_html;
	$pass_allowed_protocols = $allowed_protocols;

return preg_replace_callback( '%(|$))|(<[^>]*(>|$)|>)%', '_wp_kses_split_callback', $string );
}

/**
 * Returns an array of HTML attribute names whose value contains a URL.
 *
 * This function returns a list of all HTML attributes that must contain
 * a URL according to the HTML specification.
 *
 * This list includes URI attributes both allowed and disallowed by KSES.
 *
 * @link https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes
 *
 * @since 5.0.1
 *
 * @return string[] HTML attribute names whose value contains a URL.
 */
function wp_kses_uri_attributes() {
	$uri_attributes = array(
		'action',
		'archive',
		'background',
		'cite',
		'classid',
		'codebase',
		'data',
		'formaction',
		'href',
		'icon',
		'longdesc',
		'manifest',
		'poster',
		'profile',
		'src',
		'usemap',
		'xmlns',
	);

/**
	 * Filters the list of attributes that are required to contain a URL.
	 *
	 * Use this filter to add any `data-` attributes that are required to be
	 * validated as a URL.
	 *
	 * @since 5.0.1
	 *
	 * @param string[] $uri_attributes HTML attribute names whose value contains a URL.
	 */
	$uri_attributes = apply_filters( 'wp_kses_uri_attributes', $uri_attributes );

return $uri_attributes;
}

/**
 * Callback for `wp_kses_split()`.
 *
 * @since 3.1.0
 * @access private
 * @ignore
 *
 * @global array[]|string $pass_allowed_html      An array of allowed HTML elements and attributes,
 *                                                or a context name such as 'post'.
 * @global string[]       $pass_allowed_protocols Array of allowed URL protocols.
 *
 * @param array $matches preg_replace regexp matches
 * @return string
 */
function _wp_kses_split_callback( $match ) {
	global $pass_allowed_html, $pass_allowed_protocols;

return wp_kses_split2( $match[0], $pass_allowed_html, $pass_allowed_protocols );
}

/**
 * Callback for `wp_kses_split()` for fixing malformed HTML tags.
 *
 * This function does a lot of work. It rejects some very malformed things like
 * `<:::>`. It returns an empty string, if the element isn't allowed (look ma, no
 * `strip_tags()`!). Otherwise it splits the tag into an element and an attribute
 * list.
 *
 * After the tag is split into an element and an attribute list, it is run
 * through another filter which will remove illegal attributes and once that is
 * completed, will be returned.
 *
 * @access private
 * @ignore
 * @since 1.0.0
 *
 * @param string         $string            Content to filter.
 * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
 *                                          or a context name such as 'post'. See wp_kses_allowed_html()
 *                                          for the list of accepted context names.
 * @param string[]       $allowed_protocols Array of allowed URL protocols.
 * @return string Fixed HTML element
 */
function wp_kses_split2( $string, $allowed_html, $allowed_protocols ) {
	$string = wp_kses_stripslashes( $string );

// It matched a ">" character.
	if ( '<' !== substr( $string, 0, 1 ) ) {
		return '&gt;';
	}

// Allow HTML comments.
	if ( '' ), '', $string );
		while ( ( $newstring = wp_kses( $string, $allowed_html, $allowed_protocols ) ) != $string ) {
			$string = $newstring;
		}
		if ( '' === $string ) {
			return '';
		}
		// Prevent multiple dashes in comments.
		$string = preg_replace( '/--+/', '-', $string );
		// Prevent three dashes closing a comment.
		$string = preg_replace( '/-$/', '', $string );
		return "";
	}

// It's seriously malformed.
	if ( ! preg_match( '%^<\s*(/\s*)?([a-zA-Z0-9-]+)([^>]*)>?$%', $string, $matches ) ) {
		return '';
	}

$slash    = trim( $matches[1] );
	$elem     = $matches[2];
	$attrlist = $matches[3];

if ( ! is_array( $allowed_html ) ) {
		$allowed_html = wp_kses_allowed_html( $allowed_html );
	}

// They are using a not allowed HTML element.
	if ( ! isset( $allowed_html[ strtolower( $elem ) ] ) ) {
		return '';
	}

// No attributes are allowed for closing elements.
	if ( '' !== $slash ) {
		return "</$elem>";
	}

return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols );
}

/**
 * Removes all attributes, if none are allowed for this element.
 *
 * If some are allowed it calls `wp_kses_hair()` to split them further, and then
 * it builds up new HTML code from the data that `kses_hair()` returns. It also
 * removes `<` and `>` characters, if there are any left. One more thing it does
 * is to check if the tag has a closing XHTML slash, and if it does, it puts one
 * in the returned code as well.
 *
 * @since 1.0.0
 *
 * @param string         $element           HTML element/tag.
 * @param string         $attr              HTML attributes from HTML element to closing HTML element tag.
 * @param array[]|string $allowed_html      An array of allowed HTML elements and attributes,
 *                                          or a context name such as 'post'. See wp_kses_allowed_html()
 *                                          for the list of accepted context names.
 * @param string[]       $allowed_protocols Array of allowed URL protocols.
 * @return string Sanitized HTML element.
 */
function wp_kses_attr( $element, $attr, $allowed_html, $allowed_protocols ) {
	if ( ! is_array( $allowed_html ) ) {
		$allowed_html = wp_kses_allowed_html( $allowed_html );
	}

// Is there a closing XHTML slash at the end of the attributes?
	$xhtml_slash = '';
	if ( preg_match( '%\s*/\s*$%', $attr ) ) {
		$xhtml_slash = ' /';
	}

// Are any attributes allowed at all for this element?
	$element_low = strtolower( $element );
	if ( empty( $allowed_html[ $element_low ] ) || true === $allowed_html[ $element_low ] ) {
		return "<$element$xhtml_slash>";
	}

// Split it.
	$attrarr = wp_kses_hair( $attr, $allowed_protocols );

// Go through $attrarr, and save the allowed attributes for this element
	// in $attr2.
	$attr2 = '';
	foreach ( $attrarr as $arreach ) {
		if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) {
			$attr2 .= ' ' . $arreach['whole'];
		}
	}

// Remove any "<" or ">" characters.
	$attr2 = preg_replace( '/[<>]/', '', $attr2 );

return "<$element$attr2$xhtml_slash>";
}

/**
 * Determines whether an attribute is allowed.
 *
 * @since 4.2.3
 * @since 5.0.0 Add support for `data-*` wildcard attributes.
 *
 * @param string $name         The attribute name. Passed by reference. Returns empty string when not allowed.
 * @param string $value        The attribute value. Passed by reference. Returns a filtered value.
 * @param string $whole        The `name=value` input. Passed by reference. Returns filtered input.
 * @param string $vless        Whether the attribute is valueless. Use 'y' or 'n'.
 * @param string $element      The name of the element to which this attribute belongs.
 * @param array  $allowed_html The full list of allowed elements and attributes.
 * @return bool Whether or not the attribute is allowed.
 */
function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) {
	$name_low    = strtolower( $name );
	$element_low = strtolower( $element );

if ( ! isset( $allowed_html[ $element_low ] ) ) {
		$name  = '';
		$value = '';
		$whole = '';
		return false;
	}

$allowed_attr = $allowed_html[ $element_low ];

if ( ! isset( $allowed_attr[ $name_low ] ) || '' === $allowed_attr[ $name_low ] ) {
		/*
		 * Allow `data-*` attributes.
		 *
		 * When specifying `$allowed_html`, the attribute name should be set as
		 * `data-*` (not to be mixed with the HTML 4.0 `data` attribute, see
		 * https://www.w3.org/TR/html40/struct/objects.html#adef-data).
		 *
		 * Note: the attribute name should only contain `A-Za-z0-9_-` chars,
		 * double hyphens `--` are not accepted by WordPress.
		 */
		if ( strpos( $name_low, 'data-' ) === 0 && ! empty( $allowed_attr['data-*'] ) && preg_match( '/^data(?:-[a-z0-9_]+)+$/', $name_low, $match ) ) {
			/*
			 * Add the whole attribute name to the allowed attributes and set any restrictions
			 * for the `data-*` attribute values for the current element.
			 */
			$allowed_attr[ $match[0] ] = $allowed_attr['data-*'];
		} else {
			$name  = '';
			$value = '';
			$whole = '';
			return false;
		}
	}

if ( 'style' === $name_low ) {
		$new_value = safecss_filter_attr( $value );

if ( empty( $new_value ) ) {
			$name  = '';
			$value = '';
			$whole = '';
			return false;
		}

$whole = str_replace( $value, $new_value, $whole );
		$value = $new_value;
	}

if ( is_array( $allowed_attr[ $name_low ] ) ) {
		// There are some checks.
		foreach ( $allowed_attr[ $name_low ] as $currkey => $currval ) {
			if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) {
				$name  = '';
				$value = '';
				$whole = '';
				return false;
			}
		}
	}

return true;
}

/**
 * Builds an attribute list from string containing attributes.
 *
 * This function does a lot of work. It parses an attribute list into an array
 * with attribute data, and tries to do the right thing even if it gets weird
 * input. It will add quotes around attribute values that don't have any quotes
 * or apostrophes around them, to make it easier to produce HTML code that will
 * conform to W3C's HTML specification. It will also remove bad URL protocols
 * from attribute values. It also reduces duplicate attributes by using the
 * attribute defined first (`foo='bar' foo='baz'` will result in `foo='bar'`).
 *
 * @since 1.0.0
 *
 * @param string   $attr              Attribute list from HTML element to closing HTML element tag.
 * @param string[] $allowed_protocols Array of allowed URL protocols.
 * @return array[] Array of attribute information after parsing.
 */
function wp_kses_hair( $attr, $allowed_protocols ) {
	$attrarr  = array();
	$mode     = 0;
	$attrname = '';
	$uris     = wp_kses_uri_attributes();

// Loop through the whole attribute list.

while ( strlen( $attr ) != 0 ) {
		$working = 0; // Was the last operation successful?

switch ( $mode ) {
			case 0:
				if ( preg_match( '/^([_a-zA-Z][-_a-zA-Z0-9:.]*)/', $attr, $match ) ) {
					$attrname = $match[1];
					$working  = 1;
					$mode     = 1;
					$attr     = preg_replace( '/^[_a-zA-Z][-_a-zA-Z0-9:.]*/', '', $attr );
				}

break;

case 1:
				if ( preg_match( '/^\s*=\s*/', $attr ) ) { // Equals sign.
					$working = 1;
					$mode    = 2;
					$attr    = preg_replace( '/^\s*=\s*/', '', $attr );
					break;
				}

if ( preg_match( '/^\s+/', $attr ) ) { // Valueless.
					$working = 1;
					$mode    = 0;
					if ( false === array_key_exists( $attrname, $attrarr ) ) {
						$attrarr[ $attrname ] = array(
							'name'  => $attrname,
							'value' => '',
							'whole' => $attrname,
							'vless' => 'y',
						);
					}
					$attr = preg_replace( '/^\s+/', '', $attr );
				}

break;

case 2:
				if ( preg_match( '%^"([^"]*)"(\s+|/?$)%', $attr, $match ) ) {
					// "value"
					$thisval = $match[1];
					if ( in_array( strtolower( $attrname ), $uris, true ) ) {
						$thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols );
					}

if ( false === array_key_exists( $attrname, $attrarr ) ) {
						$attrarr[ $attrname ] = array(
							'name'  => $attrname,
							'value' => $thisval,
							'whole' => "$attrname=\"$thisval\"",
							'vless' => 'n',
						);
					}
					$working = 1;
					$mode    = 0;
					$attr    = preg_replace( '/^"[^"]*"(\s+|$)/', '', $attr );
					break;
				}

if ( preg_match( "%^'([^']*)'(\s+|/?$)%", $attr, $match ) ) {
					// 'value'
					$thisval = $match[1];
					if ( in_array( strtolower( $attrname ), $uris, true ) ) {
						$thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols );
					}

if ( false === array_key_exists( $attrname, $attrarr ) ) {
						$attrarr[ $attrname ] = array(
							'name'  => $attrname,
							'value' => $thisval,
							'whole' => "$attrname='$thisval'",
							'vless' => 'n',
						);
					}
					$working = 1;
					$mode    = 0;
					$attr    = preg_replace( "/^'[^']*'(\s+|$)/", '', $attr );
					break;
				}

if ( preg_match( "%^([^\s\"']+)(\s+|/?$)%", $attr, $match ) ) {
					// value
					$thisval = $match[1];
					if ( in_array( strtolower( $attrname ), $uris, true ) ) {
						$thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols );
					}

if ( false === array_key_exists( $attrname, $attrarr ) ) {
						$attrarr[ $attrname ] = array(
							'name'  => $attrname,
							'value' => $thisval,
							'whole' => "$attrname=\"$thisval\"",
							'vless' => 'n',
						);
					}
					// We add quotes to conform to W3C's HTML spec.
					$working = 1;
					$mode    = 0;
					$attr    = preg_replace( "%^[^\s\"']+(\s+|$)%", '', $attr );
				}

break;
		} // End switch.

if ( 0 == $working ) { // Not well-formed, remove and try again.
			$attr = wp_kses_html_error( $attr );
			$mode = 0;
		}
	} // End while.

if ( 1 == $mode && false === array_key_exists( $attrname, $attrarr ) ) {
		// Special case, for when the attribute list ends with a valueless
		// attribute like "selected".
		$attrarr[ $attrname ] = array(
			'name'  => $attrname,
			'value' => '',
			'whole' => $attrname,
			'vless' => 'y',
		);
	}

return $attrarr;
}

/**
 * Finds all attributes of an HTML element.
 *
 * Does not modify input.  May return "evil" output.
 *
 * Based on `wp_kses_split2()` and `wp_kses_attr()`.
 *
 * @since 4.2.3
 *
 * @param string $element HTML element.
 * @return array|bool List of attributes found in the element. Returns false on failure.
 */
function wp_kses_attr_parse( $element ) {
	$valid = preg_match( '%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches );
	if ( 1 !== $valid ) {
		return false;
	}

$begin  = $matches[1];
	$slash  = $matches[2];
	$elname = $matches[3];
	$attr   = $matches[4];
	$end    = $matches[5];

if ( '' !== $slash ) {
		// Closing elements do not get parsed.
		return false;
	}

// Is there a closing XHTML slash at the end of the attributes?
	if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) {
		$xhtml_slash = $matches[0];
		$attr        = substr( $attr, 0, -strlen( $xhtml_slash ) );
	} else {
		$xhtml_slash = '';
	}

// Split it.
	$attrarr = wp_kses_hair_parse( $attr );
	if ( false === $attrarr ) {
		return false;
	}

// Make sure all input is returned by adding front and back matter.
	array_unshift( $attrarr, $begin . $slash . $elname );
	array_push( $attrarr, $xhtml_slash . $end );

return $attrarr;
}

/**
 * Builds an attribute list from string containing attributes.
 *
 * Does not modify input.  May return "evil" output.
 * In case of unexpected input, returns false instead of stripping things.
 *
 * Based on `wp_kses_hair()` but does not return a multi-dimensional array.
 *
 * @since 4.2.3
 *
 * @param string $attr Attribute list from HTML element to closing HTML element tag.
 * @return array|bool List of attributes found in $attr. Returns false on failure.
 */
function wp_kses_hair_parse( $attr ) {
	if ( '' === $attr ) {
		return array();
	}

// phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
	$regex =
		'(?:'
		.     '[_a-zA-Z][-_a-zA-Z0-9:.]*' // Attribute name.
		. '|'
		.     '\[\[?[^\[\]]+\]\]?'        // Shortcode in the name position implies unfiltered_html.
		. ')'
		. '(?:'               // Attribute value.
		.     '\s*=\s*'       // All values begin with '='.
		.     '(?:'
		.         '"[^"]*"'   // Double-quoted.
		.     '|'
		.         "'[^']*'"   // Single-quoted.
		.     '|'
		.         '[^\s"\']+' // Non-quoted.
		.         '(?:\s|$)'  // Must have a space.
		.     ')'
		. '|'
		.     '(?:\s|$)'      // If attribute has no value, space is required.
		. ')'
		. '\s*';              // Trailing space is optional except as mentioned above.
	// phpcs:enable

// Although it is possible to reduce this procedure to a single regexp,
	// we must run that regexp twice to get exactly the expected result.

$validation = "%^($regex)+$%";
	$extraction = "%$regex%";

if ( 1 === preg_match( $validation, $attr ) ) {
		preg_match_all( $extraction, $attr, $attrarr );
		return $attrarr[0];
	} else {
		return false;
	}
}

/**
 * Performs different checks for attribute values.
 *
 * The currently implemented checks are "maxlen", "minlen", "maxval", "minval",
 * and "valueless".
 *
 * @since 1.0.0
 *
 * @param string $value      Attribute value.
 * @param string $vless      Whether the attribute is valueless. Use 'y' or 'n'.
 * @param string $checkname  What $checkvalue is checking for.
 * @param mixed  $checkvalue What constraint the value should pass.
 * @return bool Whether check passes.
 */
function wp_kses_check_attr_val( $value, $vless, $checkname, $checkvalue ) {
	$ok = true;

switch ( strtolower( $checkname ) ) {
		case 'maxlen':
			/*
			 * The maxlen check makes sure that the attribute value has a length not
			 * greater than the given value. This can be used to avoid Buffer Overflows
			 * in WWW clients and various Internet servers.
			 */

if ( strlen( $value ) > $checkvalue ) {
				$ok = false;
			}
			break;

case 'minlen':
			/*
			 * The minlen check makes sure that the attribute value has a length not
			 * smaller than the given value.
			 */

if ( strlen( $value ) < $checkvalue ) {
				$ok = false;
			}
			break;

case 'maxval':
			/*
			 * The maxval check does two things: it checks that the attribute value is
			 * an integer from 0 and up, without an excessive amount of zeroes or
			 * whitespace (to avoid Buffer Overflows). It also checks that the attribute
			 * value is not greater than the given value.
			 * This check can be used to avoid Denial of Service attacks.
			 */

if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) {
				$ok = false;
			}
			if ( $value > $checkvalue ) {
				$ok = false;
			}
			break;

case 'minval':
			/*
			 * The minval check makes sure that the attribute value is a positive integer,
			 * and that it is not smaller than the given value.
			 */

if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) {
				$ok = false;
			}
			if ( $value < $checkvalue ) {
				$ok = false;
			}
			break;

case 'valueless':
			/*
			 * The valueless check makes sure if the attribute has a value
			 * (like `<a href="blah">`) or not (`<option selected>`). If the given value
			 * is a "y" or a "Y", the attribute must not have a value.
			 * If the given value is an "n" or an "N", the attribute must have a value.
			 */

if ( strtolower( $checkvalue ) != $vless ) {
				$ok = false;
			}
			break;
	} // End switch.

return $ok;
}

/**
 * Sanitizes a string and removed disallowed URL protocols.
 *
 * This function removes all non-allowed protocols from the beginning of the
 * string. It ignores whitespace and the case of the letters, and it does
 * understand HTML entities. It does its work recursively, so it won't be
 * fooled by a string like `javascript:javascript:alert(57)`.
 *
 * @since 1.0.0
 *
 * @param string   $string            Content to filter bad protocols from.
 * @param string[] $allowed_protocols Array of allowed URL protocols.
 * @return string Filtered content.
 */
function wp_kses_bad_protocol( $string, $allowed_protocols ) {
	$string     = wp_kses_no_null( $string );
	$iterations = 0;

do {
		$original_string = $string;
		$string          = wp_kses_bad_protocol_once( $string, $allowed_protocols );
	} while ( $original_string != $string && ++$iterations < 6 );

if ( $original_string != $string ) {
		return '';
	}

return $string;
}

/**
 * Removes any invalid control characters in a text string.
 *
 * Also removes any instance of the `\0` string.
 *
 * @since 1.0.0
 *
 * @param string $string  Content to filter null characters from.
 * @param array  $options Set 'slash_zero' => 'keep' when '\0' is allowed. Default is 'remove'.
 * @return string Filtered content.
 */
function wp_kses_no_null( $string, $options = null ) {
	if ( ! isset( $options['slash_zero'] ) ) {
		$options = array( 'slash_zero' => 'remove' );
	}

$string = preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string );
	if ( 'remove' === $options['slash_zero'] ) {
		$string = preg_replace( '/\\\\+0+/', '', $string );
	}

return $string;
}

/**
 * Strips slashes from in front of quotes.
 *
 * This function changes the character sequence `\"` to just `"`. It leaves all other
 * slashes alone. The quoting from `preg_replace(//e)` requires this.
 *
 * @since 1.0.0
 *
 * @param string $string String to strip slashes from.
 * @return string Fixed string with quoted slashes.
 */
function wp_kses_stripslashes( $string ) {
	return preg_replace( '%\\\\"%', '"', $string );
}

/**
 * Converts the keys of an array to lowercase.
 *
 * @since 1.0.0
 *
 * @param array $inarray Unfiltered array.
 * @return array Fixed array with all lowercase keys.
 */
function wp_kses_array_lc( $inarray ) {
	$outarray = array();

foreach ( (array) $inarray as $inkey => $inval ) {
		$outkey              = strtolower( $inkey );
		$outarray[ $outkey ] = array();

foreach ( (array) $inval as $inkey2 => $inval2 ) {
			$outkey2                         = strtolower( $inkey2 );
			$outarray[ $outkey ][ $outkey2 ] = $inval2;
		}
	}

return $outarray;
}

/**
 * Handles parsing errors in `wp_kses_hair()`.
 *
 * The general plan is to remove everything to and including some whitespace,
 * but it deals with quotes and apostrophes as well.
 *
 * @since 1.0.0
 *
 * @param string $string
 * @return string
 */
function wp_kses_html_error( $string ) {
	return preg_replace( '/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string );
}

/**
 * Sanitizes content from bad protocols and other characters.
 *
 * This function searches for URL protocols at the beginning of the string, while
 * handling whitespace and HTML entities.
 *
 * @since 1.0.0
 *
 * @param string   $string            Content to check for bad protocols.
 * @param string[] $allowed_protocols Array of allowed URL protocols.
 * @param int      $count             Depth of call recursion to this function.
 * @return string Sanitized content.
 */
function wp_kses_bad_protocol_once( $string, $allowed_protocols, $count = 1 ) {
	$string  = preg_replace( '/(&#0*58(?![;0-9])|&#x0*3a(?![;a-f0-9]))/i', '$1;', $string );
	$string2 = preg_split( '/:|&#0*58;|&#x0*3a;|&colon;/i', $string, 2 );
	if ( isset( $string2[1] ) && ! preg_match( '%/\?%', $string2[0] ) ) {
		$string   = trim( $string2[1] );
		$protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols );
		if ( 'feed:' === $protocol ) {
			if ( $count > 2 ) {
				return '';
			}
			$string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count );
			if ( empty( $string ) ) {
				return $string;
			}
		}
		$string = $protocol . $string;
	}

return $string;
}

/**
 * Callback for `wp_kses_bad_protocol_once()` regular expression.
 *
 * This function processes URL protocols, checks to see if they're in the
 * list of allowed protocols or not, and returns different data depending
 * on the answer.
 *
 * @access private
 * @ignore
 * @since 1.0.0
 *
 * @param string   $string            URI scheme to check against the list of allowed protocols.
 * @param string[] $allowed_protocols Array of allowed URL protocols.
 * @return string Sanitized content.
 */
function wp_kses_bad_protocol_once2( $string, $allowed_protocols ) {
	$string2 = wp_kses_decode_entities( $string );
	$string2 = preg_replace( '/\s/', '', $string2 );
	$string2 = wp_kses_no_null( $string2 );
	$string2 = strtolower( $string2 );

$allowed = false;
	foreach ( (array) $allowed_protocols as $one_protocol ) {
		if ( strtolower( $one_protocol ) == $string2 ) {
			$allowed = true;
			break;
		}
	}

if ( $allowed ) {
		return "$string2:";
	} else {
		return '';
	}
}

/**
 * Converts and fixes HTML entities.
 *
 * This function normalizes HTML entities. It will convert `AT&T` to the correct
 * `AT&amp;T`, `&#00058;` to `&#58;`, `&#XYZZY;` to `&amp;#XYZZY;` and so on.
 *
 * When `$context` is set to 'xml', HTML entities are converted to their code points.  For
 * example, `AT&T&hellip;&#XYZZY;` is converted to `AT&amp;T…&amp;#XYZZY;`.
 *
 * @since 1.0.0
 * @since 5.5.0 Added `$context` parameter.
 *
 * @param string $string  Content to normalize entities.
 * @param string $context Context for normalization. Can be either 'html' or 'xml'.
 *                        Default 'html'.
 * @return string Content with normalized entities.
 */
function wp_kses_normalize_entities( $string, $context = 'html' ) {
	// Disarm all entities by converting & to &amp;
	$string = str_replace( '&', '&amp;', $string );

// Change back the allowed entities in our list of allowed entities.
	if ( 'xml' === $context ) {
		$string = preg_replace_callback( '/&amp;([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_xml_named_entities', $string );
	} else {
		$string = preg_replace_callback( '/&amp;([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $string );
	}
	$string = preg_replace_callback( '/&amp;#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string );
	$string = preg_replace_callback( '/&amp;#[Xx](0*[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $string );

return $string;
}

/**
 * Callback for `wp_kses_normalize_entities()` regular expression.
 *
 * This function only accepts valid named entity references, which are finite,
 * case-sensitive, and highly scrutinized by HTML and XML validators.
 *
 * @since 3.0.0
 *
 * @global array $allowedentitynames
 *
 * @param array $matches preg_replace_callback() matches array.
 * @return string Correctly encoded entity.
 */
function wp_kses_named_entities( $matches ) {
	global $allowedentitynames;

if ( empty( $matches[1] ) ) {
		return '';
	}

$i = $matches[1];
	return ( ! in_array( $i, $allowedentitynames, true ) ) ? "&amp;$i;" : "&$i;";
}

/**
 * Callback for `wp_kses_normalize_entities()` regular expression.
 *
 * This function only accepts valid named entity references, which are finite,
 * case-sensitive, and highly scrutinized by XML validators.  HTML named entity
 * references are converted to their code points.
 *
 * @since 5.5.0
 *
 * @global array $allowedentitynames
 * @global array $allowedxmlnamedentities
 *
 * @param array $matches preg_replace_callback() matches array.
 * @return string Correctly encoded entity.
 */
function wp_kses_xml_named_entities( $matches ) {
	global $allowedentitynames, $allowedxmlnamedentities;

if ( empty( $matches[1] ) ) {
		return '';
	}

$i = $matches[1];

if ( in_array( $i, $allowedxmlnamedentities, true ) ) {
		return "&$i;";
	} elseif ( in_array( $i, $allowedentitynames, true ) ) {
		return html_entity_decode( "&$i;", ENT_HTML5 );
	}

return "&amp;$i;";
}

/**
 * Callback for `wp_kses_normalize_entities()` regular expression.
 *
 * This function helps `wp_kses_normalize_entities()` to only accept 16-bit
 * values and nothing more for `&#number;` entities.
 *
 * @access private
 * @ignore
 * @since 1.0.0
 *
 * @param array $matches `preg_replace_callback()` matches array.
 * @return string Correctly encoded entity.
 */
function wp_kses_normalize_entities2( $matches ) {
	if ( empty( $matches[1] ) ) {
		return '';
	}

$i = $matches[1];
	if ( valid_unicode( $i ) ) {
		$i = str_pad( ltrim( $i, '0' ), 3, '0', STR_PAD_LEFT );
		$i = "&#$i;";
	} else {
		$i = "&amp;#$i;";
	}

return $i;
}

/**
 * Callback for `wp_kses_normalize_entities()` for regular expression.
 *
 * This function helps `wp_kses_normalize_entities()` to only accept valid Unicode
 * numeric entities in hex form.
 *
 * @since 2.7.0
 * @access private
 * @ignore
 *
 * @param array $matches `preg_replace_callback()` matches array.
 * @return string Correctly encoded entity.
 */
function wp_kses_normalize_entities3( $matches ) {
	if ( empty( $matches[1] ) ) {
		return '';
	}

$hexchars = $matches[1];
	return ( ! valid_unicode( hexdec( $hexchars ) ) ) ? "&amp;#x$hexchars;" : '&#x' . ltrim( $hexchars, '0' ) . ';';
}

/**
 * Determines if a Unicode codepoint is valid.
 *
 * @since 2.7.0
 *
 * @param int $i Unicode codepoint.
 * @return bool Whether or not the codepoint is a valid Unicode codepoint.
 */
function valid_unicode( $i ) {
	return ( 0x9 == $i || 0xa == $i || 0xd == $i ||
			( 0x20 <= $i && $i <= 0xd7ff ) ||
			( 0xe000 <= $i && $i <= 0xfffd ) ||
			( 0x10000 <= $i && $i <= 0x10ffff ) );
}

/**
 * Converts all numeric HTML entities to their named counterparts.
 *
 * This function decodes numeric HTML entities (`&#65;` and `&#x41;`).
 * It doesn't do anything with named entities like `&auml;`, but we don't
 * need them in the allowed URL protocols system anyway.
 *
 * @since 1.0.0
 *
 * @param string $string Content to change entities.
 * @return string Content after decoded entities.
 */
function wp_kses_decode_entities( $string ) {
	$string = preg_replace_callback( '/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string );
	$string = preg_replace_callback( '/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string );

return $string;
}

/**
 * Regex callback for `wp_kses_decode_entities()`.
 *
 * @since 2.9.0
 * @access private
 * @ignore
 *
 * @param array $match preg match
 * @return string
 */
function _wp_kses_decode_entities_chr( $match ) {
	return chr( $match[1] );
}

/**
 * Sanitize content with allowed HTML KSES rules.
 *
 * This function expects slashed data.
 *
 * @since 1.0.0
 *
 * @param string $data Content to filter, expected to be escaped with slashes.
 * @return string Filtered content.
 */
function wp_filter_kses( $data ) {
	return addslashes( wp_kses( stripslashes( $data ), current_filter() ) );
}

/**
 * Sanitize content with allowed HTML KSES rules.
 *
 * This function expects unslashed data.
 *
 * @since 2.9.0
 *
 * @param string $data Content to filter, expected to not be escaped.
 * @return string Filtered content.
 */
function wp_kses_data( $data ) {
	return wp_kses( $data, current_filter() );
}

/**
 * Sanitizes content for allowed HTML tags for post content.
 *
 * Post content refers to the page contents of the 'post' type and not `$_POST`
 * data from forms.
 *
 * This function expects slashed data.
 *
 * @since 2.0.0
 *
 * @param string $data Post content to filter, expected to be escaped with slashes.
 * @return string Filtered post content with allowed HTML tags and attributes intact.
 */
function wp_filter_post_kses( $data ) {
	return addslashes( wp_kses( stripslashes( $data ), 'post' ) );
}

/**
 * Sanitizes content for allowed HTML tags for post content.
 *
 * Post content refers to the page contents of the 'post' type and not `$_POST`
 * data from forms.
 *
 * This function expects unslashed data.
 *
 * @since 2.9.0
 *
 * @param string $data Post content to filter.
 * @return string Filtered post content with allowed HTML tags and attributes intact.
 */
function wp_kses_post( $data ) {
	return wp_kses( $data, 'post' );
}

/**
 * Navigates through an array, object, or scalar, and sanitizes content for
 * allowed HTML tags for post content.
 *
 * @since 4.4.2
 *
 * @see map_deep()
 *
 * @param mixed $data The array, object, or scalar value to inspect.
 * @return mixed The filtered content.
 */
function wp_kses_post_deep( $data ) {
	return map_deep( $data, 'wp_kses_post' );
}

/**
 * Strips all HTML from a text string.
 *
 * This function expects slashed data.
 *
 * @since 2.1.0
 *
 * @param string $data Content to strip all HTML from.
 * @return string Filtered content without any HTML.
 */
function wp_filter_nohtml_kses( $data ) {
	return addslashes( wp_kses( stripslashes( $data ), 'strip' ) );
}

/**
 * Adds all KSES input form content filters.
 *
 * All hooks have default priority. The `wp_filter_kses()` function is added to
 * the 'pre_comment_content' and 'title_save_pre' hooks.
 *
 * The `wp_filter_post_kses()` function is added to the 'content_save_pre',
 * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks.
 *
 * @since 2.0.0
 */
function kses_init_filters() {
	// Normal filtering.
	add_filter( 'title_save_pre', 'wp_filter_kses' );

// Comment filtering.
	if ( current_user_can( 'unfiltered_html' ) ) {
		add_filter( 'pre_comment_content', 'wp_filter_post_kses' );
	} else {
		add_filter( 'pre_comment_content', 'wp_filter_kses' );
	}

// Post filtering.
	add_filter( 'content_save_pre', 'wp_filter_post_kses' );
	add_filter( 'excerpt_save_pre', 'wp_filter_post_kses' );
	add_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' );
}

/**
 * Removes all KSES input form content filters.
 *
 * A quick procedural method to removing all of the filters that KSES uses for
 * content in WordPress Loop.
 *
 * Does not remove the `kses_init()` function from {@see 'init'} hook (priority is
 * default). Also does not remove `kses_init()` function from {@see 'set_current_user'}
 * hook (priority is also default).
 *
 * @since 2.0.6
 */
function kses_remove_filters() {
	// Normal filtering.
	remove_filter( 'title_save_pre', 'wp_filter_kses' );

// Comment filtering.
	remove_filter( 'pre_comment_content', 'wp_filter_post_kses' );
	remove_filter( 'pre_comment_content', 'wp_filter_kses' );

// Post filtering.
	remove_filter( 'content_save_pre', 'wp_filter_post_kses' );
	remove_filter( 'excerpt_save_pre', 'wp_filter_post_kses' );
	remove_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' );
}

/**
 * Sets up most of the KSES filters for input form content.
 *
 * First removes all of the KSES filters in case the current user does not need
 * to have KSES filter the content. If the user does not have `unfiltered_html`
 * capability, then KSES filters are added.
 *
 * @since 2.0.0
 */
function kses_init() {
	kses_remove_filters();

if ( ! current_user_can( 'unfiltered_html' ) ) {
		kses_init_filters();
	}
}

/**
 * Filters an inline style attribute and removes disallowed rules.
 *
 * @since 2.8.1
 *
 * @param string $css        A string of CSS rules.
 * @param string $deprecated Not used.
 * @return string Filtered string of CSS rules.
 */
function safecss_filter_attr( $css, $deprecated = '' ) {
	if ( ! empty( $deprecated ) ) {
		_deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented.
	}

$css = wp_kses_no_null( $css );
	$css = str_replace( array( "\n", "\r", "\t" ), '', $css );

$allowed_protocols = wp_allowed_protocols();

$css_array = explode( ';', trim( $css ) );

/**
	 * Filters list of allowed CSS attributes.
	 *
	 * @since 2.8.1
	 * @since 4.4.0 Added support for `min-height`, `max-height`, `min-width`, and `max-width`.
	 * @since 4.6.0 Added support for `list-style-type`.
	 * @since 5.0.0 Added support for `background-image`.
	 * @since 5.1.0 Added support for `text-transform`.
	 * @since 5.2.0 Added support for `background-position` and `grid-template-columns`.
	 * @since 5.3.0 Added support for `grid`, `flex` and `column` layout properties.
	 *              Extend `background-*` support of individual properties.
	 * @since 5.3.1 Added support for gradient backgrounds.
	 *
	 * @param string[] $attr Array of allowed CSS attributes.
	 */
	$allowed_attr = apply_filters(
		'safe_style_css',
		array(
			'background',
			'background-color',
			'background-image',
			'background-position',
			'background-size',
			'background-attachment',
			'background-blend-mode',

'border',
			'border-radius',
			'border-width',
			'border-color',
			'border-style',
			'border-right',
			'border-right-color',
			'border-right-style',
			'border-right-width',
			'border-bottom',
			'border-bottom-color',
			'border-bottom-style',
			'border-bottom-width',
			'border-left',
			'border-left-color',
			'border-left-style',
			'border-left-width',
			'border-top',
			'border-top-color',
			'border-top-style',
			'border-top-width',

'border-spacing',
			'border-collapse',
			'caption-side',

'columns',
			'column-count',
			'column-fill',
			'column-gap',
			'column-rule',
			'column-span',
			'column-width',

'color',
			'font',
			'font-family',
			'font-size',
			'font-style',
			'font-variant',
			'font-weight',
			'letter-spacing',
			'line-height',
			'text-align',
			'text-decoration',
			'text-indent',
			'text-transform',

'height',
			'min-height',
			'max-height',

'width',
			'min-width',
			'max-width',

'margin',
			'margin-right',
			'margin-bottom',
			'margin-left',
			'margin-top',

'padding',
			'padding-right',
			'padding-bottom',
			'padding-left',
			'padding-top',

'flex',
			'flex-basis',
			'flex-direction',
			'flex-flow',
			'flex-grow',
			'flex-shrink',

'grid-template-columns',
			'grid-auto-columns',
			'grid-column-start',
			'grid-column-end',
			'grid-column-gap',
			'grid-template-rows',
			'grid-auto-rows',
			'grid-row-start',
			'grid-row-end',
			'grid-row-gap',
			'grid-gap',

'justify-content',
			'justify-items',
			'justify-self',
			'align-content',
			'align-items',
			'align-self',

'clear',
			'cursor',
			'direction',
			'float',
			'list-style-type',
			'overflow',
			'vertical-align',
		)
	);

/*
	 * CSS attributes that accept URL data types.
	 *
	 * This is in accordance to the CSS spec and unrelated to
	 * the sub-set of supported attributes above.
	 *
	 * See: https://developer.mozilla.org/en-US/docs/Web/CSS/url
	 */
	$css_url_data_types = array(
		'background',
		'background-image',

'cursor',

'list-style',
		'list-style-image',
	);

/*
	 * CSS attributes that accept gradient data types.
	 *
	 */
	$css_gradient_data_types = array(
		'background',
		'background-image',
	);

if ( empty( $allowed_attr ) ) {
		return $css;
	}

$css = '';
	foreach ( $css_array as $css_item ) {
		if ( '' === $css_item ) {
			continue;
		}

$css_item        = trim( $css_item );
		$css_test_string = $css_item;
		$found           = false;
		$url_attr        = false;
		$gradient_attr   = false;

if ( strpos( $css_item, ':' ) === false ) {
			$found = true;
		} else {
			$parts        = explode( ':', $css_item, 2 );
			$css_selector = trim( $parts[0] );

if ( in_array( $css_selector, $allowed_attr, true ) ) {
				$found         = true;
				$url_attr      = in_array( $css_selector, $css_url_data_types, true );
				$gradient_attr = in_array( $css_selector, $css_gradient_data_types, true );
			}
		}

if ( $found && $url_attr ) {
			// Simplified: matches the sequence `url(*)`.
			preg_match_all( '/url$[^)]+$/', $parts[1], $url_matches );

foreach ( $url_matches[0] as $url_match ) {
				// Clean up the URL from each of the matches above.
				preg_match( '/^url$\s*([\'\"]?)(.*)(\g1)\s*$$/', $url_match, $url_pieces );

if ( empty( $url_pieces[2] ) ) {
					$found = false;
					break;
				}

$url = trim( $url_pieces[2] );

if ( empty( $url ) || wp_kses_bad_protocol( $url, $allowed_protocols ) !== $url ) {
					$found = false;
					break;
				} else {
					// Remove the whole `url(*)` bit that was matched above from the CSS.
					$css_test_string = str_replace( $url_match, '', $css_test_string );
				}
			}
		}

if ( $found && $gradient_attr ) {
			$css_value = trim( $parts[1] );
			if ( preg_match( '/^(repeating-)?(linear|radial|conic)-gradient$([^()]|rgb[a]?\([^()]*$)*\)$/', $css_value ) ) {
				// Remove the whole `gradient` bit that was matched above from the CSS.
				$css_test_string = str_replace( $css_value, '', $css_test_string );
			}
		}

if ( $found ) {
			// Check for any CSS containing \ ( & } = or comments, except for url() usage checked above.
			$allow_css = ! preg_match( '%[\\\(&=}]|/\*%', $css_test_string );

/**
			 * Filters the check for unsafe CSS in `safecss_filter_attr`.
			 *
			 * Enables developers to determine whether a section of CSS should be allowed or discarded.
			 * By default, the value will be false if the part contains \ ( & } = or comments.
			 * Return true to allow the CSS part to be included in the output.
			 *
			 * @since 5.5.0
			 *
			 * @param bool   $allow_css       Whether the CSS in the test string is considered safe.
			 * @param string $css_test_string The CSS string to test.
			 */
			$allow_css = apply_filters( 'safecss_filter_attr_allow_css', $allow_css, $css_test_string );

// Only add the CSS part if it passes the regex check.
			if ( $allow_css ) {
				if ( '' !== $css ) {
					$css .= ';';
				}

$css .= $css_item;
			}
		}
	}

return $css;
}

/**
 * Helper function to add global attributes to a tag in the allowed HTML list.
 *
 * @since 3.5.0
 * @since 5.0.0 Add support for `data-*` wildcard attributes.
 * @access private
 * @ignore
 *
 * @param array $value An array of attributes.
 * @return array The array of attributes with global attributes added.
 */
function _wp_add_global_attributes( $value ) {
	$global_attributes = array(
		'aria-describedby' => true,
		'aria-details'     => true,
		'aria-label'       => true,
		'aria-labelledby'  => true,
		'aria-hidden'      => true,
		'class'            => true,
		'id'               => true,
		'style'            => true,
		'title'            => true,
		'role'             => true,
		'data-*'           => true,
	);

if ( true === $value ) {
		$value = array();
	}

if ( is_array( $value ) ) {
		return array_merge( $value, $global_attributes );
	}

return $value;
}

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