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Derived Collections =================== You can create custom collection classes by extending the ``Doctrine\Common\Collections\ArrayCollection`` class. If the ``__construct`` semantics are different from the default ``ArrayCollection`` you can override the ``createFrom`` method: .. code-block:: php final class DerivedArrayCollection extends ArrayCollection { /** @var \stdClass */ private $foo; public function __construct(\stdClass $foo, array $elements = []) { $this->foo = $foo; parent::__construct($elements); } protected function createFrom(array $elements) : self { return new static($this->foo, $elements); } }

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