Credis_Client::select PHP Method

    public function select($index)
    {
        $response = $this->__call('select', array($index));
        $this->selectedDb = (int) $index;
        return $response;
    }

function Redis_Connect($xmlFile)
{
    if (!is_readable($xmlFile)) {
        throw new Exception(sprintf('File "%s" does not exits or is not readable.', $xmlFile));
    }
    $xml = simplexml_load_file($xmlFile, 'SimpleXMLElement', LIBXML_NOCDATA);
    /** @noinspection PhpUndefinedFieldInspection */
    $host = strval($xml->global->cache->backend_options->server);
    /** @noinspection PhpUndefinedFieldInspection */
    $port = strval($xml->global->cache->backend_options->port);
    /** @noinspection PhpUndefinedFieldInspection */
    $db = strval($xml->global->cache->backend_options->database);
    if (empty($host)) {
        throw new Exception(sprintf('Redis server hostname is not found in "%s".', $xmlFile));
    }
    if (empty($port)) {
        throw new Exception(sprintf('Redis server port is not found in "%s".', $xmlFile));
    }
    if (!strlen($db)) {
        throw new Exception(sprintf('Redis database number is not found in "%s".', $xmlFile));
    }
    if ('/' == substr($host, 0, 1)) {
        // Socket
        $server = $host;
    } else {
        // TCP
        $server = sprintf('tcp://%s:%d', $host, $port);
    }
    $client = new Credis_Client($server);
    $client->select($db);
    return $client;
}