vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/ManyToManyPersister.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\Persisters;

use Doctrine\ORM\Mapping\ClassMetadata;
use Doctrine\ORM\PersistentCollection;
use Doctrine\ORM\UnitOfWork;

/**
 * Persister for many-to-many collections.
 *
 * @author  Roman Borschel <roman@code-factory.org>
 * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author  Alexander <iam.asm89@gmail.com>
 * @since   2.0
 */
class ManyToManyPersister extends AbstractCollectionPersister
{
    /**
     * {@inheritdoc}
     *
     * @override
     */
    protected function getDeleteRowSQL(PersistentCollection $coll)
    {
        $columns    = array();
        $mapping    = $coll->getMapping();
        $class      = $this->em->getClassMetadata(get_class($coll->getOwner()));
        $tableName  = $this->quoteStrategy->getJoinTableName($mapping, $class, $this->platform);

        foreach ($mapping['joinTable']['joinColumns'] as $joinColumn) {
            $columns[] = $this->quoteStrategy->getJoinColumnName($joinColumn, $class, $this->platform);
        }

        foreach ($mapping['joinTable']['inverseJoinColumns'] as $joinColumn) {
            $columns[] = $this->quoteStrategy->getJoinColumnName($joinColumn, $class, $this->platform);
        }

        return 'DELETE FROM ' . $tableName
             . ' WHERE ' . implode(' = ? AND ', $columns) . ' = ?';
    }

    /**