PHP IRC BOT und BNC Login

<?php

//So the bot doesnt stop.

set_time_limit(0);

ini_set('display_errors', 'on');


//Example connection stuff.

$config = array(
'server' => 'server',
'port' => 'port',
'nick' => 'Decryptor',
'name' => 'Decryptor',
'pass' => 'Passwort',
'Ident' => 'Decryptor',
'USERID' => 'Decryptor',
'chan' => '#test2',
);


class IRCBot {
 var $socket;
 var $ex = array();

 function __construct($config)
 {
 $this->socket = fsockopen($config['server'], $config['port']);
 $this->login($config);
 $this->main();
 $this->send_data('JOIN', '#chat');
 }


 function login($config)
 {
 $this->send_data('USERID', $config['nick']);
 $this->send_data('USER', $config['nick'], $config['nick'].' :'.$config['name']);
 $this->send_data('NICK', $config['nick']);
 sleep(6);
 $this->send_data('JOIN', $config['chan']);
 }


 function main()
 {

 $data = fgets($this->socket, 128);
 flush();
 $this->ex = explode(' ', $data);
 if($this->ex[0] == 'PING')
 {
 $this->send_data('PONG', $this->ex[1]); //Plays ping-pong with the server to stay connected.
 }
 $command = str_replace(array(chr(10), chr(13)), '', $this->ex[3]);

 echo $this->ex[0];

 if(preg_match("/Decryptor/", $this->ex[0]))
 {
 switch($command) //List of commands the bot responds to from a user.
 {
 case ':!quit':
 $this->send_data('QUIT', 'acidavengers.co.uk made Bot');
 break;
 case ':nix':
 print_r($this);
 break;
 }
 }
 $this->main();
 }

 function send_data($cmd, $msg = null) //displays stuff to the broswer and sends data to the server.
 {
 if($msg == null)
 {
 fputs($this->socket, $cmd."\r\n");
 echo "$cmd \n";
 } else {
 fputs($this->socket, $cmd.' '.$msg."\r\n");
 echo "$cmd, $msg \n";
 }
 }
}
$bot = new IRCBot($config);

?>