valide sup art (simplifié)

<?php
        include('../config.inc.php');
        $db=new mysqli(SERVEUR,USER,PASS,BASE);
        $numart=$_POST["numart"];
        $data=$exec->fetch_object();
    $req="DELETE FROM dutaf_articles WHERE num_art=".$numart;
        $exec=$db->query($req);
        echo "Vous venez de supprimer l'article.";
        mysqli_close($db);
?>