2 Notices/errors?

[AndyPants]

Hello, I currently am running a gameing server and found some php code to send RCON commands to my game server. I am completly new to PHP, but not new to code. I would appreceate if someone could fix these 2 lines of code.

On my XAMPP server I have these two php files:

credits.php:

<?php
$uname = $_GET['username'];

include_once("rcon.class.php");

$r = new rcon("**.***.***.**",27015,"*************");
$r->Auth();

echo "Authenticated\n";

//Send a request
var_dump($r->rconCommand('kick ' . $uname));


?>

rcon.class.php:

<?php
/*
    Basic CS:S Rcon class by Freman.  (V1.00)
    ----------------------------------------------
    Ok, it's a completely working class now with with multi-packet responses

    Contact: printf("%s%s%s%s%s%s%s%s%s%d%s%s%s","rc","on",chr(46),"cl","ass",chr(64),"pri","ya",chr(46),2,"y",chr(46),"net")

    Behaviour I've noticed:
    rcon is not returning the packet id.
*/

define("SERVERDATA_EXECCOMMAND",2);
define("SERVERDATA_AUTH",3);

class RCon {
    var $Password;
    var $Host;
    var $Port = 27015;
    var $_Sock = null;
    var $_Id = 0;

    function RCon ($Host,$Port,$Password) {
    $this->Password = $Password;
    $this->Host = $Host;
    $this->Port = $Port;
    $this->_Sock = @fsockopen($this->Host,$this->Port, $errno, $errstr, 30) or
        die("Unable to open socket: $errstr ($errno)\n");
    $this->_Set_Timeout($this->_Sock,2,500);
    }

    function Auth () {
    $PackID = $this->_Write(SERVERDATA_AUTH,$this->Password);

    // Real response (id: -1 = failure)
    $ret = $this->_PacketRead();
    if ($ret[1]['id'] == -1) {
        die("Authentication Failure\n");
    }
    }

    function _Set_Timeout(&$res,$s,$m=0) {
    if (version_compare(phpversion(),'4.3.0','<')) {
        return socket_set_timeout($res,$s,$m);
    }
    return stream_set_timeout($res,$s,$m);
    }

    function _Write($cmd, $s1='', $s2='') {
    // Get and increment the packet id
    $id = ++$this->_Id;

    // Put our packet together
    $data = pack("VV",$id,$cmd).$s1.chr(0).$s2.chr(0);

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

    // Send packet
    fwrite($this->_Sock,$data,strlen($data));

    // In case we want it later we'll return the packet id
    return $id;
    }

    function _PacketRead() {
    //Declare the return array
    $retarray = array();
    //Fetch the packet size
    while ($size = @fread($this->_Sock,4)) {
        $size = unpack('V1Size',$size);
        //Work around valve breaking the protocol
        if ($size["Size"] > 4096) {
        //pad with 8 nulls
        $packet = "\x00\x00\x00\x00\x00\x00\x00\x00".fread($this->_Sock,4096);
        } else {
        //Read the packet back
        $packet = fread($this->_Sock,$size["Size"]);
        }
        array_push($retarray,unpack("V1ID/V1Response/a*S1/a*S2",$packet));
    }
    return $retarray;
    }

    function Read() {
    $Packets = $this->_PacketRead();

    foreach($Packets as $pack) {
        if (isset($ret[$pack['ID']])) {
        $ret[$pack['ID']]['S1'] .= $pack['S1'];
        $ret[$pack['ID']]['S2'] .= $pack['S1'];
        } else {
        $ret[$pack['ID']] = array(
                    'Response' => $pack['Response'],
                    'S1' => $pack['S1'],
                    'S2' => $pack['S2'],
                    );
        }
    }
    return $ret;
    }

    function sendCommand($Command) {
    $Command = '"'.trim(str_replace(' ','" "', $Command)).'"';
    $this->_Write(SERVERDATA_EXECCOMMAND,$Command,'');
    }

    function rconCommand($Command) {
    $this->sendcommand($Command);

    $ret = $this->Read();

    //ATM: Source servers don't return the request id, but if they fix this the code below should read as
    // return $ret[$this->_Id]['S1'];
    return $ret[0]['S1'];
    }
}
?>

When i go to "http://localhost/credits.php?username=SilentKiller", I recieve:

Notice: Undefined index: id in C:\xampp\htdocs\rcon.class.php on line 37
Authenticated
Notice: Undefined offset: 0 in C:\xampp\htdocs\rcon.class.php on line 115
NULL 

[diafol]

Looks like $ret doesn't have index [0] and $ret[1]['id'] isn't set.
Other than that I'm afraid I can't make much sense of the code. Seems this is what's creating your $ret array:

function _PacketRead() {
    //Declare the return array
    $retarray = array();
    //Fetch the packet size
    while ($size = @fread($this->_Sock,4)) {
        $size = unpack('V1Size',$size);
        //Work around valve breaking the protocol
        if ($size["Size"] > 4096) {
        //pad with 8 nulls
        $packet = "\x00\x00\x00\x00\x00\x00\x00\x00".fread($this->_Sock,4096);
        } else {
        //Read the packet back
        $packet = fread($this->_Sock,$size["Size"]);
        }
        array_push($retarray,unpack("V1ID/V1Response/a*S1/a*S2",$packet));
    }
    return $retarray;
}

$retarray (which I assume becomes $ret) is emtpy to start. It then gets a 'unpack("V1ID/V1Response/aS1/aS2",$packet)' pushed into it. Without knowing what that data looks like, I'd be whistling in the dark.