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Edit File : README.md \| Size : 9.33 KB
# DeepCopy DeepCopy helps you create deep copies (clones) of your objects. It is designed to handle cycles in the association graph. [![Total Downloads](https://poser.pugx.org/myclabs/deep-copy/downloads.svg)](https://packagist.org/packages/myclabs/deep-copy) [![Integrate](https://github.com/myclabs/DeepCopy/workflows/ci/badge.svg?branch=1.x)](https://github.com/myclabs/DeepCopy/actions) ## Table of Contents 1. [How](#how) 1. [Why](#why) 1. [Using simply `clone`](#using-simply-clone) 1. [Overriding `__clone()`](#overriding-__clone) 1. [With `DeepCopy`](#with-deepcopy) 1. [How it works](#how-it-works) 1. [Going further](#going-further) 1. [Matchers](#matchers) 1. [Property name](#property-name) 1. [Specific property](#specific-property) 1. [Type](#type) 1. [Filters](#filters) 1. [`SetNullFilter`](#setnullfilter-filter) 1. [`KeepFilter`](#keepfilter-filter) 1. [`DoctrineCollectionFilter`](#doctrinecollectionfilter-filter) 1. [`DoctrineEmptyCollectionFilter`](#doctrineemptycollectionfilter-filter) 1. [`DoctrineProxyFilter`](#doctrineproxyfilter-filter) 1. [`ReplaceFilter`](#replacefilter-type-filter) 1. [`ShallowCopyFilter`](#shallowcopyfilter-type-filter) 1. [Edge cases](#edge-cases) 1. [Contributing](#contributing) 1. [Tests](#tests) ## How? Install with Composer: ``` composer require myclabs/deep-copy ``` Use it: ```php use DeepCopy\DeepCopy; $copier = new DeepCopy(); $myCopy = $copier->copy($myObject); ``` ## Why? - How do you create copies of your objects? ```php $myCopy = clone $myObject; ``` - How do you create deep copies of your objects (i.e. copying also all the objects referenced in the properties)? You use [`__clone()`](http://www.php.net/manual/en/language.oop5.cloning.php#object.clone) and implement the behavior yourself. - But how do you handle cycles in the association graph? Now you're in for a big mess :( ![association graph](doc/graph.png) ### Using simply `clone` ![Using clone](doc/clone.png) ### Overriding `__clone()` ![Overriding __clone](doc/deep-clone.png) ### With `DeepCopy` ![With DeepCopy](doc/deep-copy.png) ## How it works DeepCopy recursively traverses all the object's properties and clones them. To avoid cloning the same object twice it keeps a hash map of all instances and thus preserves the object graph. To use it: ```php use function DeepCopy\deep_copy; $copy = deep_copy($var); ``` Alternatively, you can create your own `DeepCopy` instance to configure it differently for example: ```php use DeepCopy\DeepCopy; $copier = new DeepCopy(true); $copy = $copier->copy($var); ``` You may want to roll your own deep copy function: ```php namespace Acme; use DeepCopy\DeepCopy; function deep_copy($var) { static $copier = null; if (null === $copier) { $copier = new DeepCopy(true); } return $copier->copy($var); } ``` ## Going further You can add filters to customize the copy process. The method to add a filter is `DeepCopy\DeepCopy::addFilter($filter, $matcher)`, with `$filter` implementing `DeepCopy\Filter\Filter` and `$matcher` implementing `DeepCopy\Matcher\Matcher`. We provide some generic filters and matchers. ### Matchers - `DeepCopy\Matcher` applies on a object attribute. - `DeepCopy\TypeMatcher` applies on any element found in graph, including array elements. #### Property name The `PropertyNameMatcher` will match a property by its name: ```php use DeepCopy\Matcher\PropertyNameMatcher; // Will apply a filter to any property of any objects named "id" $matcher = new PropertyNameMatcher('id'); ``` #### Specific property The `PropertyMatcher` will match a specific property of a specific class: ```php use DeepCopy\Matcher\PropertyMatcher; // Will apply a filter to the property "id" of any objects of the class "MyClass" $matcher = new PropertyMatcher('MyClass', 'id'); ``` #### Type The `TypeMatcher` will match any element by its type (instance of a class or any value that could be parameter of [gettype()](http://php.net/manual/en/function.gettype.php) function): ```php use DeepCopy\TypeMatcher\TypeMatcher; // Will apply a filter to any object that is an instance of Doctrine\Common\Collections\Collection $matcher = new TypeMatcher('Doctrine\Common\Collections\Collection'); ``` ### Filters - `DeepCopy\Filter` applies a transformation to the object attribute matched by `DeepCopy\Matcher` - `DeepCopy\TypeFilter` applies a transformation to any element matched by `DeepCopy\TypeMatcher` #### `SetNullFilter` (filter) Let's say for example that you are copying a database record (or a Doctrine entity), so you want the copy not to have any ID: ```php use DeepCopy\DeepCopy; use DeepCopy\Filter\SetNullFilter; use DeepCopy\Matcher\PropertyNameMatcher; $object = MyClass::load(123); echo $object->id; // 123 $copier = new DeepCopy(); $copier->addFilter(new SetNullFilter(), new PropertyNameMatcher('id')); $copy = $copier->copy($object); echo $copy->id; // null ``` #### `KeepFilter` (filter) If you want a property to remain untouched (for example, an association to an object): ```php use DeepCopy\DeepCopy; use DeepCopy\Filter\KeepFilter; use DeepCopy\Matcher\PropertyMatcher; $copier = new DeepCopy(); $copier->addFilter(new KeepFilter(), new PropertyMatcher('MyClass', 'category')); $copy = $copier->copy($object); // $copy->category has not been touched ``` #### `DoctrineCollectionFilter` (filter) If you use Doctrine and want to copy an entity, you will need to use the `DoctrineCollectionFilter`: ```php use DeepCopy\DeepCopy; use DeepCopy\Filter\Doctrine\DoctrineCollectionFilter; use DeepCopy\Matcher\PropertyTypeMatcher; $copier = new DeepCopy(); $copier->addFilter(new DoctrineCollectionFilter(), new PropertyTypeMatcher('Doctrine\Common\Collections\Collection')); $copy = $copier->copy($object); ``` #### `DoctrineEmptyCollectionFilter` (filter) If you use Doctrine and want to copy an entity who contains a `Collection` that you want to be reset, you can use the `DoctrineEmptyCollectionFilter` ```php use DeepCopy\DeepCopy; use DeepCopy\Filter\Doctrine\DoctrineEmptyCollectionFilter; use DeepCopy\Matcher\PropertyMatcher; $copier = new DeepCopy(); $copier->addFilter(new DoctrineEmptyCollectionFilter(), new PropertyMatcher('MyClass', 'myProperty')); $copy = $copier->copy($object); // $copy->myProperty will return an empty collection ``` #### `DoctrineProxyFilter` (filter) If you use Doctrine and use cloning on lazy loaded entities, you might encounter errors mentioning missing fields on a Doctrine proxy class (...\\\_\_CG\_\_\Proxy). You can use the `DoctrineProxyFilter` to load the actual entity behind the Doctrine proxy class. Make sure, though, to put this as one of your very first filters in the filter chain so that the entity is loaded before other filters are applied! ```php use DeepCopy\DeepCopy; use DeepCopy\Filter\Doctrine\DoctrineProxyFilter; use DeepCopy\Matcher\Doctrine\DoctrineProxyMatcher; $copier = new DeepCopy(); $copier->addFilter(new DoctrineProxyFilter(), new DoctrineProxyMatcher()); $copy = $copier->copy($object); // $copy should now contain a clone of all entities, including those that were not yet fully loaded. ``` #### `ReplaceFilter` (type filter) 1. If you want to replace the value of a property: ```php use DeepCopy\DeepCopy; use DeepCopy\Filter\ReplaceFilter; use DeepCopy\Matcher\PropertyMatcher; $copier = new DeepCopy(); $callback = function ($currentValue) { return $currentValue . ' (copy)' }; $copier->addFilter(new ReplaceFilter($callback), new PropertyMatcher('MyClass', 'title')); $copy = $copier->copy($object); // $copy->title will contain the data returned by the callback, e.g. 'The title (copy)' ``` 2. If you want to replace whole element: ```php use DeepCopy\DeepCopy; use DeepCopy\TypeFilter\ReplaceFilter; use DeepCopy\TypeMatcher\TypeMatcher; $copier = new DeepCopy(); $callback = function (MyClass $myClass) { return get_class($myClass); }; $copier->addTypeFilter(new ReplaceFilter($callback), new TypeMatcher('MyClass')); $copy = $copier->copy([new MyClass, 'some string', new MyClass]); // $copy will contain ['MyClass', 'some string', 'MyClass'] ``` The `$callback` parameter of the `ReplaceFilter` constructor accepts any PHP callable. #### `ShallowCopyFilter` (type filter) Stop DeepCopy from recursively copying element, using standard `clone` instead: ```php use DeepCopy\DeepCopy; use DeepCopy\TypeFilter\ShallowCopyFilter; use DeepCopy\TypeMatcher\TypeMatcher; use Mockery as m; $this->deepCopy = new DeepCopy(); $this->deepCopy->addTypeFilter( new ShallowCopyFilter, new TypeMatcher(m\MockInterface::class) ); $myServiceWithMocks = new MyService(m::mock(MyDependency1::class), m::mock(MyDependency2::class)); // All mocks will be just cloned, not deep copied ``` ## Edge cases The following structures cannot be deep-copied with PHP Reflection. As a result they are shallow cloned and filters are not applied. There is two ways for you to handle them: - Implement your own `__clone()` method - Use a filter with a type matcher ## Contributing DeepCopy is distributed under the MIT license. ### Tests Running the tests is simple: ```php vendor/bin/phpunit ``` ### Support Get professional support via [the Tidelift Subscription](https://tidelift.com/subscription/pkg/packagist-myclabs-deep-copy?utm_source=packagist-myclabs-deep-copy&utm_medium=referral&utm_campaign=readme). Back

Edit File : README.md | Size : 9.33 KB

# DeepCopy

DeepCopy helps you create deep copies (clones) of your objects. It is designed to handle cycles in the association graph.

[![Total Downloads](https://poser.pugx.org/myclabs/deep-copy/downloads.svg)](https://packagist.org/packages/myclabs/deep-copy)
[![Integrate](https://github.com/myclabs/DeepCopy/workflows/ci/badge.svg?branch=1.x)](https://github.com/myclabs/DeepCopy/actions)

## Table of Contents

1. [How](#how)
1. [Why](#why)
    1. [Using simply `clone`](#using-simply-clone)
    1. [Overriding `__clone()`](#overriding-__clone)
    1. [With `DeepCopy`](#with-deepcopy)
1. [How it works](#how-it-works)
1. [Going further](#going-further)
    1. [Matchers](#matchers)
        1. [Property name](#property-name)
        1. [Specific property](#specific-property)
        1. [Type](#type)
    1. [Filters](#filters)
        1. [`SetNullFilter`](#setnullfilter-filter)
        1. [`KeepFilter`](#keepfilter-filter)
        1. [`DoctrineCollectionFilter`](#doctrinecollectionfilter-filter)
        1. [`DoctrineEmptyCollectionFilter`](#doctrineemptycollectionfilter-filter)
        1. [`DoctrineProxyFilter`](#doctrineproxyfilter-filter)
        1. [`ReplaceFilter`](#replacefilter-type-filter)
        1. [`ShallowCopyFilter`](#shallowcopyfilter-type-filter)
1. [Edge cases](#edge-cases)
1. [Contributing](#contributing)
    1. [Tests](#tests)

## How?

Install with Composer:

```
composer require myclabs/deep-copy
```

Use it:

```php
use DeepCopy\DeepCopy;

$copier = new DeepCopy();
$myCopy = $copier->copy($myObject);
```

## Why?

- How do you create copies of your objects?

```php
$myCopy = clone $myObject;
```

- How do you create **deep** copies of your objects (i.e. copying also all the objects referenced in the properties)?

You use [`__clone()`](http://www.php.net/manual/en/language.oop5.cloning.php#object.clone) and implement the behavior
yourself.

- But how do you handle **cycles** in the association graph?

Now you're in for a big mess :(

![association graph](doc/graph.png)

### Using simply `clone`

![Using clone](doc/clone.png)

### Overriding `__clone()`

![Overriding __clone](doc/deep-clone.png)

### With `DeepCopy`

![With DeepCopy](doc/deep-copy.png)

## How it works

DeepCopy recursively traverses all the object's properties and clones them. To avoid cloning the same object twice it
keeps a hash map of all instances and thus preserves the object graph.

To use it:

```php
use function DeepCopy\deep_copy;

$copy = deep_copy($var);
```

Alternatively, you can create your own `DeepCopy` instance to configure it differently for example:

```php
use DeepCopy\DeepCopy;

$copier = new DeepCopy(true);

$copy = $copier->copy($var);
```

You may want to roll your own deep copy function:

```php
namespace Acme;

use DeepCopy\DeepCopy;

function deep_copy($var)
{
    static $copier = null;
    
    if (null === $copier) {
        $copier = new DeepCopy(true);
    }
    
    return $copier->copy($var);
}
```

## Going further

You can add filters to customize the copy process.

The method to add a filter is `DeepCopy\DeepCopy::addFilter($filter, $matcher)`,
with `$filter` implementing `DeepCopy\Filter\Filter`
and `$matcher` implementing `DeepCopy\Matcher\Matcher`.

We provide some generic filters and matchers.

### Matchers

- `DeepCopy\Matcher` applies on a object attribute.
  - `DeepCopy\TypeMatcher` applies on any element found in graph, including array elements.

#### Property name

The `PropertyNameMatcher` will match a property by its name:

```php
use DeepCopy\Matcher\PropertyNameMatcher;

// Will apply a filter to any property of any objects named "id"
$matcher = new PropertyNameMatcher('id');
```

#### Specific property

The `PropertyMatcher` will match a specific property of a specific class:

```php
use DeepCopy\Matcher\PropertyMatcher;

// Will apply a filter to the property "id" of any objects of the class "MyClass"
$matcher = new PropertyMatcher('MyClass', 'id');
```

#### Type

The `TypeMatcher` will match any element by its type (instance of a class or any value that could be parameter of
[gettype()](http://php.net/manual/en/function.gettype.php) function):

```php
use DeepCopy\TypeMatcher\TypeMatcher;

// Will apply a filter to any object that is an instance of Doctrine\Common\Collections\Collection
$matcher = new TypeMatcher('Doctrine\Common\Collections\Collection');
```

### Filters

- `DeepCopy\Filter` applies a transformation to the object attribute matched by `DeepCopy\Matcher`
- `DeepCopy\TypeFilter` applies a transformation to any element matched by `DeepCopy\TypeMatcher`

#### `SetNullFilter` (filter)

Let's say for example that you are copying a database record (or a Doctrine entity), so you want the copy not to have
any ID:

```php
use DeepCopy\DeepCopy;
use DeepCopy\Filter\SetNullFilter;
use DeepCopy\Matcher\PropertyNameMatcher;

$object = MyClass::load(123);
echo $object->id; // 123

$copier = new DeepCopy();
$copier->addFilter(new SetNullFilter(), new PropertyNameMatcher('id'));

$copy = $copier->copy($object);

echo $copy->id; // null
```

#### `KeepFilter` (filter)

If you want a property to remain untouched (for example, an association to an object):

```php
use DeepCopy\DeepCopy;
use DeepCopy\Filter\KeepFilter;
use DeepCopy\Matcher\PropertyMatcher;

$copier = new DeepCopy();
$copier->addFilter(new KeepFilter(), new PropertyMatcher('MyClass', 'category'));

$copy = $copier->copy($object);
// $copy->category has not been touched
```

#### `DoctrineCollectionFilter` (filter)

If you use Doctrine and want to copy an entity, you will need to use the `DoctrineCollectionFilter`:

```php
use DeepCopy\DeepCopy;
use DeepCopy\Filter\Doctrine\DoctrineCollectionFilter;
use DeepCopy\Matcher\PropertyTypeMatcher;

$copier = new DeepCopy();
$copier->addFilter(new DoctrineCollectionFilter(), new PropertyTypeMatcher('Doctrine\Common\Collections\Collection'));

$copy = $copier->copy($object);
```

#### `DoctrineEmptyCollectionFilter` (filter)

If you use Doctrine and want to copy an entity who contains a `Collection` that you want to be reset, you can use the
`DoctrineEmptyCollectionFilter`

```php
use DeepCopy\DeepCopy;
use DeepCopy\Filter\Doctrine\DoctrineEmptyCollectionFilter;
use DeepCopy\Matcher\PropertyMatcher;

$copier = new DeepCopy();
$copier->addFilter(new DoctrineEmptyCollectionFilter(), new PropertyMatcher('MyClass', 'myProperty'));

$copy = $copier->copy($object);

// $copy->myProperty will return an empty collection
```

#### `DoctrineProxyFilter` (filter)

If you use Doctrine and use cloning on lazy loaded entities, you might encounter errors mentioning missing fields on a
Doctrine proxy class (...\\\_\_CG\_\_\Proxy).
You can use the `DoctrineProxyFilter` to load the actual entity behind the Doctrine proxy class.
**Make sure, though, to put this as one of your very first filters in the filter chain so that the entity is loaded
before other filters are applied!**

```php
use DeepCopy\DeepCopy;
use DeepCopy\Filter\Doctrine\DoctrineProxyFilter;
use DeepCopy\Matcher\Doctrine\DoctrineProxyMatcher;

$copier = new DeepCopy();
$copier->addFilter(new DoctrineProxyFilter(), new DoctrineProxyMatcher());

$copy = $copier->copy($object);

// $copy should now contain a clone of all entities, including those that were not yet fully loaded.
```

#### `ReplaceFilter` (type filter)

1. If you want to replace the value of a property:

```php
use DeepCopy\DeepCopy;
use DeepCopy\Filter\ReplaceFilter;
use DeepCopy\Matcher\PropertyMatcher;

$copier = new DeepCopy();
$callback = function ($currentValue) {
  return $currentValue . ' (copy)'
};
$copier->addFilter(new ReplaceFilter($callback), new PropertyMatcher('MyClass', 'title'));

$copy = $copier->copy($object);

// $copy->title will contain the data returned by the callback, e.g. 'The title (copy)'
```

2. If you want to replace whole element:

```php
use DeepCopy\DeepCopy;
use DeepCopy\TypeFilter\ReplaceFilter;
use DeepCopy\TypeMatcher\TypeMatcher;

$copier = new DeepCopy();
$callback = function (MyClass $myClass) {
  return get_class($myClass);
};
$copier->addTypeFilter(new ReplaceFilter($callback), new TypeMatcher('MyClass'));

$copy = $copier->copy([new MyClass, 'some string', new MyClass]);

// $copy will contain ['MyClass', 'some string', 'MyClass']
```

The `$callback` parameter of the `ReplaceFilter` constructor accepts any PHP callable.

#### `ShallowCopyFilter` (type filter)

Stop *DeepCopy* from recursively copying element, using standard `clone` instead:

```php
use DeepCopy\DeepCopy;
use DeepCopy\TypeFilter\ShallowCopyFilter;
use DeepCopy\TypeMatcher\TypeMatcher;
use Mockery as m;

$this->deepCopy = new DeepCopy();
$this->deepCopy->addTypeFilter(
	new ShallowCopyFilter,
	new TypeMatcher(m\MockInterface::class)
);

$myServiceWithMocks = new MyService(m::mock(MyDependency1::class), m::mock(MyDependency2::class));
// All mocks will be just cloned, not deep copied
```

## Edge cases

The following structures cannot be deep-copied with PHP Reflection. As a result they are shallow cloned and filters are
not applied. There is two ways for you to handle them:

- Implement your own `__clone()` method
- Use a filter with a type matcher

## Contributing

DeepCopy is distributed under the MIT license.

### Tests

Running the tests is simple:

```php
vendor/bin/phpunit
```

### Support

Get professional support via [the Tidelift Subscription](https://tidelift.com/subscription/pkg/packagist-myclabs-deep-copy?utm_source=packagist-myclabs-deep-copy&utm_medium=referral&utm_campaign=readme).

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