carthandler.php

<?php

if (!isset($_SESSION)) {
    session_start();
} //Without it session variables would not work

if (isset($_SESSION['cart'])) { //If session variable cart is already made (1 product or more already in the cart, then add new product to next pos in array)
    $checker = array_column($_SESSION['cart'], 'item_name'); //Check if same product is already in cart

    if (in_array($_REQUEST['cart_name'], $checker)) { //needle, haystack
        echo "<script>
        
        alert('Toode on juba ostukorvis!');
        
        window.location.href='details.php?details_id=". $_REQUEST['cart_id'] . "';

        </script>";
    } else {
        $count = count($_SESSION['cart']); //Count the items in the cart

        $_SESSION['cart'][$count] = array(
            'item_id' => $_REQUEST['cart_id'],
            'item_name' => $_REQUEST['cart_name'],
            'item_price' => $_REQUEST['cart_price'],
            'item_picture' => $_REQUEST['cart_picture'],
            'quantity' =>  $_REQUEST['cart_quantity']
        );

        echo "<script>
        window.location.href='product.php';
        </script>";
    } 
} else { //if cart session is not yet made (cart is empty), add the new product on index 0 in array
    $_SESSION['cart'][0] = array(
        'item_id' => $_REQUEST['cart_id'],
        'item_name' => $_REQUEST['cart_name'],
        'item_price' => $_REQUEST['cart_price'],
        'item_picture' => $_REQUEST['cart_picture'],
        'quantity' => $_REQUEST['cart_quantity']
    );
    
    echo "<script>
    window.location.href='product.php';
    </script>";
}


//print_r($_SESSION['cart']);

// session_destroy();