4D1 Server query

<?php
//Code by momo5502
//Published under GPL <http://www.gnu.org/licenses/>

    $server   = "react.kthx.at";
    $port     = 20810;

    $getservers = "\xFF\xFF\xFF\xFFgetservers IW4 145 empty full\x00";

    $connect = @fsockopen( "udp://" . $server, $port);

    fwrite( $connect, $getservers );
    $servers = array();
    $data = fread( $connect, 8192 );

    //echo $data;
    $data = substr($data, 0x17);
    $count = 0;

    while( strpos($data, "\\") )
    {
        $count++;
        $cdata = substr( $data, 0, strpos( $data, "\\"));
        $str1 = substr( $cdata, 0, 4 );
        $str2 = substr( $cdata, 4, 6 );

        $ip = ord($str1[0]) . "." . ord($str1[1]) . "." . ord($str1[2]) . "." . ord($str1[3]);
        $port = hexdec(dechex(ord($str2[0])) . dechex(ord($str2[1])));
        $server = array( "ip" => $ip, "port" => $port );
        array_push( $servers, $server );
        $data = substr( $data, strpos( $data, "\\") + 1);
    }

    fclose( $connect );

    echo json_encode($servers);
?>