Подскажите с фильтром

function check($msg){ 

if (is_array($msg)) {

foreach($msg as $key=>$val) {
$msg[$key] = check($val);
}

} else {
$msg = htmlspecialchars($msg); 
$search = array('|','\'','$','\\','^','%','`',"\0");
$replace = array('|',''','$','\','^','%','`','');

$msg = str_replace($search, $replace, $msg);
$msg = stripslashes(trim($msg));
}

return $msg;
}

function check_full($message){ 
$message=str_replace("|","I",$message); 
$message=str_replace("||","I",$message);
$message=str_replace("&","",$message);
$message=str_replace("\"","",$message);
$message=str_replace(">","",$message);
$message=str_replace("<","",$message);
$message=htmlspecialchars($message);                  
$message=str_replace("'","",$message);            
$message=str_replace("\"","",$message);  
$message=str_replace("\$","",$message);    
$message=str_replace("$","",$message);          
$message=str_replace("\\","", $message);                            
$message=str_replace("`","", $message);    
$message=str_replace("%","", $message);
$message=stripslashes(trim($message));               
return $message;
}