Question

I dont really understand why this is not working, I am being returned to the correct header but the item is still in the array!

Here is the remove from array code:

<?php
session_start();
if ( !isset($_SESSION['username']) )
{
  header("Location:loginform.php");
  exit();
}

foreach ($_SESSION['list'] as $key => $disk)
{
  if (($_SESSION['list'][$key]['bookisbn']) - ($_GET['bookisbn'])== 0)
  {
    unset($_SESSION['list'][$key]);
    break;
  }
}
header("Location: ".$_GET['location']);
exit();
?>

Thank you for any help you can offer

Answer 1

This is only a guess but the problem may lie in the fact that

$_GET['bookisbn']

is being treated as a string. Therefore if you cast it to an int
the if statement will return true removing the item from the
array.

Introduce this code:

// Casting the ISBN to an integer here
$bookISBN = (int) $_GET['bookisbn'];

if( ($_SESSION['list'][$key]['bookisbn'] - $bookISBN) == 0 ) {
    // Unset item
}