Send Console Command PHP

<?php

/**
* Return a byte and split it out of the string
*  - unsigned char
*
* @param string    $string String
*/

function getByte(&$string) {
    $data = substr($string, 0, 1);

    $string = substr($string, 1);

    $data = unpack('Cvalue', $data);

    return $data['value'];
}

/**
* Return an unsigned short and split it out of the string
*  - unsigned short (16 bit, big endian byte order)
*
* @param string    $string String
*/

function getShortUnsigned(&$string) {
    $data = substr($string, 0, 2);

    $string = substr($string, 2);

    $data = unpack('nvalue', $data);

    return $data['value'];
}

/**
* Return a signed short and split it out of the string
*  - signed short (16 bit, machine byte order)
*
* @param string    $string String
*/

function getShortSigned(&$string) {
    $data = substr($string, 0, 2);

    $string = substr($string, 2);

    $data = unpack('svalue', $data);

    return $data['value'];
}

/**
* Return a long and split it out of the string
*  - unsigned long (32 bit, little endian byte order)
*
* @param string    $string String
*/

function getLong(&$string) {
    $data = substr($string, 0, 4);

    $string = substr($string, 4);

    $data = unpack('Vvalue', $data);

    return $data['value'];
}

/**
* Return a float and split it out of the string
*
* @param string    $string String
*/

function getFloat(&$string) {
    $data = substr($string, 0, 4);

    $string = substr($string, 4);

    $array = unpack("fvalue", $data);

    return $array['value'];
}

/**
* Return a string and split it out of the string
*
* @param string    $string String
*/

function getString(&$string) {
    $data = "";

    $byte = substr($string, 0, 1);

    $string = substr($string, 1);

    while (ord($byte) != "0") {
        $data .= $byte;
        $byte = substr($string, 0, 1);
        $string = substr($string, 1);
    }

    return $data;
}
// Constant
define('PACKET_SIZE', '1400');
define('SERVERQUERY_INFO', "\xFF\xFF\xFF\xFFTSource Engine Query");
define ('REPLY_INFO', "\x49");
define('SERVERQUERY_GETCHALLENGE', "\xFF\xFF\xFF\xFF\x57");
define ('REPLY_GETCHALLENGE', "\x41");
define('SERVERDATA_AUTH', 3);
define ('SERVERDATA_EXECCOMMAND', 2);

// Ip address and port
$_ip = '123.234.012.234' ; // server ip
$_port = '27015'; // server port
$_password = 'MyP@ssw0rd!' ; // your rcon password
$s2 = '';
$command = 'map tc_hydro'; // the rcon command! Put the command you want here
$requestId = 1;

// open connection with server
$socket = fsockopen ('tcp://'.$_ip, $_port, $errno, $errstr, 30);

// Send auth packet

// Construct packet
$data = pack("VV", $requestId, SERVERDATA_AUTH).$_password.chr(0).$s2.chr(0);

// Prefix the packet by its size
$data = pack("V",strlen($data)).$data;

// Send packet
fwrite ($socket, $data, strlen($data));
$requestId++ ;

// Check if auth is successful
$junk = fread ($socket, PACKET_SIZE);

$string = fread ($socket, PACKET_SIZE);
$size = getLong($string);
$id = getLong ($string);

if($id == -1) {
    // Error
    die('Auth failed: bad password !');
}

// Sending the command and getting the answer
$data = pack("VV", $requestId, SERVERDATA_EXECCOMMAND).$command.chr(0).$s2.chr(0);

// Prefix the packet by its size
$data = pack("V", strlen ($data)).$data;

// Send packet
fwrite ($socket, $data, strlen($data));
$requestId++;

// Read response
$i = 0;
$text = '';

while($string = fread($socket, 4)) {
    $info[$i]['size'] = getLong($string);
    $string = fread($socket, $info[$i]['size']);
    $info[$i]['id'] = getLong ($string);
    $info[$i]['type'] = getLong ($string);
    $info[$i]['s1'] = getString ($string);
    $info[$i]['s2'] = getString ($string);
    $text .= $info[$i]['s1'];
    $i++;
}
?>