DeepCopy helps you create deep copies (clones) of your objects. It is designed to handle cycles in the association graph.
Install with Composer:
composer require myclabs/deep-copyUse simply:
use DeepCopy\DeepCopy;
$deepCopy = new DeepCopy();
$myCopy = $deepCopy->copy($myObject);- How do you create copies of your objects?
$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() and implement the behavior yourself.
- But how do you handle cycles in the association graph?
Now you're in for a big mess :(
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.
You can add filters to customize the copy process.
The method to add a filter is $deepCopy->addFilter($filter, $matcher),
with $filter implementing DeepCopy\Filter\Filter
and $matcher implementing DeepCopy\Matcher\Matcher.
We provide some generic filters and matchers.
DeepCopy\Matcherapplies on a object attribute.DeepCopy\TypeMatcherapplies on any element found in graph, including array elements.
The PropertyNameMatcher will match a property by its name:
use DeepCopy\Matcher\PropertyNameMatcher;
$matcher = new PropertyNameMatcher('id');
// will apply a filter to any property of any objects named "id"The PropertyMatcher will match a specific property of a specific class:
use DeepCopy\Matcher\PropertyMatcher;
$matcher = new PropertyMatcher('MyClass', 'id');
// will apply a filter to the property "id" of any objects of the class "MyClass"The TypeMatcher will match any element by its type (instance of a class or any value that could be parameter of gettype() function):
use DeepCopy\TypeMatcher\TypeMatcher;
$matcher = new TypeMatcher('Doctrine\Common\Collections\Collection');
// will apply a filter to any object that is an instance of Doctrine\Common\Collections\CollectionDeepCopy\Filterapplies a transformation to the object attribute matched byDeepCopy\Matcher.DeepCopy\TypeFilterapplies a transformation to any element matched byDeepCopy\TypeMatcher.
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:
use DeepCopy\DeepCopy;
use DeepCopy\Filter\SetNullFilter;
use DeepCopy\Matcher\PropertyNameMatcher;
$myObject = MyClass::load(123);
echo $myObject->id; // 123
$deepCopy = new DeepCopy();
$deepCopy->addFilter(new SetNullFilter(), new PropertyNameMatcher('id'));
$myCopy = $deepCopy->copy($myObject);
echo $myCopy->id; // nullIf you want a property to remain untouched (for example, an association to an object):
use DeepCopy\DeepCopy;
use DeepCopy\Filter\KeepFilter;
use DeepCopy\Matcher\PropertyMatcher;
$deepCopy = new DeepCopy();
$deepCopy->addFilter(new KeepFilter(), new PropertyMatcher('MyClass', 'category'));
$myCopy = $deepCopy->copy($myObject);
// $myCopy->category has not been touched- If you want to replace the value of a property:
use DeepCopy\DeepCopy;
use DeepCopy\Filter\ReplaceFilter;
use DeepCopy\Matcher\PropertyMatcher;
$deepCopy = new DeepCopy();
$callback = function ($currentValue) {
return $currentValue . ' (copy)'
};
$deepCopy->addFilter(new ReplaceFilter($callback), new PropertyMatcher('MyClass', 'title'));
$myCopy = $deepCopy->copy($myObject);
// $myCopy->title will contain the data returned by the callback, e.g. 'The title (copy)'- If you want to replace whole element:
use DeepCopy\DeepCopy;
use DeepCopy\TypeFilter\ReplaceFilter;
use DeepCopy\TypeMatcher\TypeMatcher;
$deepCopy = new DeepCopy();
$callback = function (MyClass $myClass) {
return get_class($myClass);
};
$deepCopy->addTypeFilter(new ReplaceFilter($callback), new TypeMatcher('MyClass'));
$myCopy = $deepCopy->copy(array(new MyClass, 'some string', new MyClass));
// $myCopy will contain ['MyClass', 'some string', 'MyClass']The $callback parameter of the ReplaceFilter constructor accepts any PHP callable.
Stop DeepCopy from recursively copying element, using standard clone instead:
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-copiedIf you use Doctrine and want to copy an entity, you will need to use the DoctrineCollectionFilter:
use DeepCopy\DeepCopy;
use DeepCopy\Filter\Doctrine\DoctrineCollectionFilter;
use DeepCopy\Matcher\PropertyTypeMatcher;
$deepCopy = new DeepCopy();
$deepCopy->addFilter(new DoctrineCollectionFilter(), new PropertyTypeMatcher('Doctrine\Common\Collections\Collection'));
$myCopy = $deepCopy->copy($myObject);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
use DeepCopy\DeepCopy;
use DeepCopy\Filter\Doctrine\DoctrineEmptyCollectionFilter;
use DeepCopy\Matcher\PropertyMatcher;
$deepCopy = new DeepCopy();
$deepCopy->addFilter(new DoctrineEmptyCollectionFilter(), new PropertyMatcher('MyClass', 'myProperty'));
$myCopy = $deepCopy->copy($myObject);
// $myCopy->myProperty will return an empty collectionIf 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!
use DeepCopy\DeepCopy;
use DeepCopy\Filter\Doctrine\DoctrineProxyFilter;
use DeepCopy\Matcher\Doctrine\DoctrineProxyMatcher;
$deepCopy = new DeepCopy();
$deepCopy->addFilter(new DoctrineProxyFilter(), new DoctrineProxyMatcher());
$myCopy = $deepCopy->copy($myObject);
// $myCopy should now contain a clone of all entities, including those that were not yet fully loaded.DeepCopy is distributed under the MIT license.
Running the tests is simple:
phpunit