SQL Injection Note

Code from PHPWind forum in global.php：

set_magic_quotes_runtime(0);

if(!get_magic_quotes_gpc()){
	Add_S($_POST);
	Add_S($_GET);
	Add_S($_COOKIE);
}
Add_S($_FILES);

function Add_S(&$array){
	foreach($array as $key=>$value){
		if(!is_array($value)){
			$array[$key]=addslashes($value);
		}else{
			Add_S($array[$key]);
		}
	}
}