vendor/doctrine/orm/lib/Doctrine/ORM/PersistentCollection.php

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<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ORM;

use Doctrine\ORM\Mapping\ClassMetadata;

use Doctrine\Common\Collections\Collection;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Selectable;
use Doctrine\Common\Collections\Criteria;

use Closure;

/**
 * A PersistentCollection represents a collection of elements that have persistent state.
 *
 * Collections of entities represent only the associations (links) to those entities.
 * That means, if the collection is part of a many-many mapping and you remove
 * entities from the collection, only the links in the relation table are removed (on flush).
 * Similarly, if you remove entities from a collection that is part of a one-many
 * mapping this will only result in the nulling out of the foreign keys on flush.
 *
 * @since     2.0
 * @author    Konsta Vesterinen <kvesteri@cc.hut.fi>
 * @author    Roman Borschel <roman@code-factory.org>
 * @author    Giorgio Sironi <piccoloprincipeazzurro@gmail.com>
 * @author    Stefano Rodriguez <stefano.rodriguez@fubles.com>
 * @todo      Design for inheritance to allow custom implementations?
 */
final class PersistentCollection implements Collection, Selectable
{
    /**
     * A snapshot of the collection at the moment it was fetched from the database.
     * This is used to create a diff of the collection at commit time.
     *
     * @var array
     */
    private $snapshot = array();

    /**
     * The entity that owns this collection.
     *
     * @var object