vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/Mysqli/MysqliConnection.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\DBAL\Driver\Mysqli;

use Doctrine\DBAL\Driver\Connection as Connection;
use Doctrine\DBAL\Driver\PingableConnection;
use Doctrine\DBAL\Driver\ServerInfoAwareConnection;

/**
 * @author Kim Hemsø Rasmussen <kimhemsoe@gmail.com>
 * @author Till Klampaeckel <till@php.net>
 */
class MysqliConnection implements Connection, PingableConnection, ServerInfoAwareConnection
{
    /**
     * Name of the option to set connection flags
     */
    const OPTION_FLAGS = 'flags';

    /**
     * @var \mysqli
     */
    private $_conn;

    /**
     * @param array  $params
     * @param string $username
     * @param string $password
     * @param array  $driverOptions
     *
     * @throws \Doctrine\DBAL\Driver\Mysqli\MysqliException
     */
    public function __construct(array $params, $username, $password, array $driverOptions = array())
    {
        $port = isset($params['port']) ? $params['port'] : ini_get('mysqli.default_port');

        // Fallback to default MySQL port if not given.
        if ( ! $port) {
            $port = 3306;
        }

        $socket = isset($params['unix_socket']) ? $params['unix_socket'] : ini_get('mysqli.default_socket');
        $dbname = isset($params['dbname']) ? $params['dbname'] : null;