Predis\Connection\StreamConnection::createStreamSocket PHP Method

    protected function createStreamSocket(ParametersInterface $parameters, $address, $flags)
    {
        $timeout = isset($parameters->timeout) ? (double) $parameters->timeout : 5.0;
        if (!($resource = @stream_socket_client($address, $errno, $errstr, $timeout, $flags))) {
            $this->onConnectionError(trim($errstr), $errno);
        }
        if (isset($parameters->read_write_timeout)) {
            $rwtimeout = (double) $parameters->read_write_timeout;
            $rwtimeout = $rwtimeout > 0 ? $rwtimeout : -1;
            $timeoutSeconds = floor($rwtimeout);
            $timeoutUSeconds = ($rwtimeout - $timeoutSeconds) * 1000000;
            stream_set_timeout($resource, $timeoutSeconds, $timeoutUSeconds);
        }
        if (isset($parameters->tcp_nodelay) && function_exists('socket_import_stream')) {
            $socket = socket_import_stream($resource);
            socket_set_option($socket, SOL_TCP, TCP_NODELAY, (int) $parameters->tcp_nodelay);
        }
        return $resource;
    }