shopping cart quantity update

my code doesn't update the quantity(shopping cart)

[sanji41]

hi guys!
i've written a shopping cart script, every thing is fine. but it cant update the quantity when i try to add another, and it also adds when the window refreshed. please help! here is the code::
>>that is the code for quantity..

 <td><input type="text" id="quantity" name="quantity-<?php echo $_POST['quantity'];?><?php echo $row['id_products'];?>" size="5" value="<?php echo $_SESSION['cart'][$row['id_products']]['quantity'];?>"></td>
  
  <td><?php echo "$" . $row['price'];?></td>
  <td><?php echo "$" . $_SESSION['cart'][$row['id_products']]['quantity']*$row['price'];?></td>
  </tr>
  <?php

>>this is the session(same page)

if (isset($_POST['submit'])){
foreach($_POST as $key){
$key = explode("-",$key);
$key = end($key);
$key = explode("submit", $key);
$key = end($key);

if($_POST['quantity-'.$key] == 0){
unset($_SESSION['cart'] [$key]);
//echo "Unset session";
}else{
$_SESSION['cart'][$key]['quantity'] = $value;
//echo "Updated session";
}


}
}

please help.

[enigma1]

where is the $value variable set? Is it via the $_POST['quantity'] ?

What you want to do is to add the new posted quantity to the session quantity to keep track of the total.

[sanji41]

thanks for the reply, I already fixed it. the problem is this:
foreach($_POST as $key){ it should be $key => $value..silly me :D
anyways hope someone will find this helpful.. thanks guys!