while (true)
{
    // disconnected every 5 seconds...
    receive_message('127.0.0.1','90',5);
}

function receive_message($ipServer,$portNumber,$nbSecondsIdle)
{
    // creating the socket...
    $socket = stream_socket_server('tcp://'.$ipServer.':'.$portNumber, $errno, $errstr);
    if (!$socket)
    {
        echo "$errstr ($errno)<br />\n";
    }
    else
    {
        // while there is connection, i'll receive it... if I didn't receive a message within
        // $nbSecondsIdle seconds, the following function will stop.
        while ($conn = @stream_socket_accept($socket,$nbSecondsIdle))
        {
            $message = fread($conn, 1024);
            
            $c = "--- ".date("d-m-Y H:i:s")." -----------------------\r\n";
            $fp = fopen("log.txt", "a+");
            $c .= $message."\r\n";
            $c .= "-----------------------------------------------\r\n";
            fputs($fp, $c);
            fclose($fp);

            fputs ($conn, "OK\n");
            fclose ($conn);
        }
        fclose($socket);
    }
}