$val = $_POST['val'];
if (get_magic_quotes_gpc()) $val = stripslashes($val);
$lst = explode(',', $val);
foreach($lst as $id)
{
	$id = trim($id);
	if ($id)
	{
		$req = "INSERT INTO mabase ('numero') VALUES ('".addslashes($id)."')"; 
		// requete et tout ca
	}
}