Bonjour!

voilà je voudrais pouvoir modifier la quantité de chaque article dans mon panier mais au lieu de ça, ça me modifie toutes les quantités des articles que le client à mis dans son panier

voici mon code :
[code]
<?
session_start();

$sessionidclient = $_SESSION['id_client'];
$article = $_POST['article'];
$quantite = $_POST['quantite'];

// connexion à la BDD

$req1 = "SELECT ref_produit, prix_produit FROM produit WHERE designation_produit = '".$article."'";
$query1 = mysql_query($req1) or die(mysql_error());
$fetch1 = mysql_fetch_array($query1);

$total = $fetch1[1]*$quantite;


$inser = "INSERT INTO panier (id_cli, ref_produit, quantite, total) VALUES ( '".$_SESSION['id_client']."','".$fetch1[0]."', '".$quantite."', '".$total."')";

$inquer = mysql_query($inser) or die(mysql_error());
$affected = mysql_affected_rows();

$reqtot = "SELECT sum(total) FROM panier WHERE id_cli = '".$_SESSION['id_client']."' ";
$querytot = mysql_query($reqtot) or die(mysql_error());
$fetchtot = mysql_fetch_array($querytot);

$select = "SELECT ref_produit, quantite, total FROM panier WHERE id_cli = '".$_SESSION['id_client']."' ";
$quersel = mysql_query($select) or die(mysql_error());

echo "<table border= 2>
<tr>
<td><center><b>Designation</td></center></b>
<td><center><b>Quantite</td></center></b>
<td><center><b>Prix(en €)</td> </center></b>
<td><center><b>Total produit</td></center></b>
<td>Modifier</td></tr>";

while($fetchsel = mysql_fetch_array($quersel))
{

$selectdesi = "SELECT designation_produit, prix_produit FROM produit WHERE ref_produit = '".$fetchsel[0]."'";

$querdesi = mysql_query($selectdesi) or die(mysql_error());
while ($fetchdesi = mysql_fetch_array($querdesi))
{

if(isset($_POST['sub_form']))
{
if ($_POST['sub_form'] == 'modifier')
{
$modif = "UPDATE panier SET quantite = ".$_POST['quantite'].", total = ".$fetchdesi[1] * $_POST['quantite']."
WHERE ref_produit = '".$fetchsel[0]."' AND id_cli = '".$_SESSION['id_client']."'";
echo $modif;
$res = mysql_query($modif) or die (mysql_error());
$fetchmodif = mysql_affected_rows();
}
}

$reqtott = "SELECT sum(total) FROM panier WHERE id_cli = '".$_SESSION['id_client']."' ";

$querytott = mysql_query($reqtott) or die(mysql_error());
$fetchtott = mysql_fetch_array($querytott);

if(isset ($fetchmodif))
{
echo "<form method= 'post' action='{$_SERVER['PHP_SELF']}'>";
echo "<tr>
<td>".$fetchdesi[0]."</td>
<td><input type = text name = quantite value = ".$_POST['quantite']." ></td>
<td>".$fetchdesi[1]."</td>
<td>".$fetchdesi[1] * $_POST['quantite']."</td>
<td><input type = submit name = 'sub_form' value = 'modifier'></td>
</form>
</tr>
";
}
else
{
echo "<form method= 'post' action='{$_SERVER['PHP_SELF']}'>";
echo "<tr>
<td>".$fetchdesi[0]."</td>
<td><input type = text name = quantite value = ".$fetchsel[1]." ></td>
<td>".$fetchdesi[1]."</td>
<td>".$total."</td>
<td><input type = submit name = 'sub_form' value = 'modifier'></td>
</form>
</tr>
";

}

}
}

if (isset ($fetchmodif))
{
echo "
<tr><td></td><td></td><b><center> </b></td><td align = \"center\"><b>Total : ".$fetchtott[0]." €</b></td></tr>";
echo"</table>";
}
else
{

echo "
<tr><td></td><td></td><b><center> </b></td><td align = \"center\"><b>Total : ".$fetchtot[0]." €</b></td></tr>";

echo"</table>
";
}



echo "<br><br>";
echo "<a href = essaipanier.php>Retour</a><br>";
echo "<a href = index.php>Accueil</a>";

?>
[/code]

je vous remercie beaucoup pour votre aide ...