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-# 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).