Question

I have the following code. i want the elseif part to check if $pId is already in the array and if it is i want to increase its quantity and price rather than adding a new $pId to the array.

I don’t know if i am using the wrong method or if my array structure is wrong but i cant get it to increase those values

if (!isset($_SESSION['cart'])) {
    $_SESSION['cart'] = array();
    $_SESSION['cart']['pid'][] = $pid;
    $_SESSION['cart']['pid']['price'] = $price;
    $_SESSION['cart']['pid']['quantity'] = $quantity;
    $_SESSION['cart']['total_price'] = $price;
    $_SESSION['cart']['total_items'] = $quantity;
}elseif(array_key_exists($pid, $_SESSION['cart'])){
    //increase price
    //increase quantity
}else{
    $_SESSION['cart']['pid'][] = $pid;
    $_SESSION['cart']['pid']['price'] = $price;
    $_SESSION['cart']['total_price'] += $price;
    $_SESSION['cart']['total_items'] += $quantity;
}

Answer 1

I’ve added an extra dimension to the array so you could easily select it.

if (!isset($_SESSION['cart'])) {
    $_SESSION['cart'] = array('pid' => array(), 'total_price' => 0, 'total_items' => 0);
    $_SESSION['cart']['pid'][$pid] = array();
    $_SESSION['cart']['pid'][$pid]['price'] = $price;
    $_SESSION['cart']['pid'][$pid]['quantity'] = $quantity;
    $_SESSION['cart']['total_price'] = $price;
    $_SESSION['cart']['total_items'] = $quantity;
}elseif(array_key_exists($pid, $_SESSION['cart']['pid'])){
    $_SESSION['cart']['pid'][$pid]['price'] = 'new price';
    $_SESSION['cart']['pid'][$pid]['quantity'] = 'new quantity';
}else{
    $_SESSION['cart']['pid'][$pid]['price'] = $price;
    $_SESSION['cart']['total_price'] += $price;
    $_SESSION['cart']['total_items'] += $quantity;
}

I don’t know what pid stands for, but at first glance it doesn’t really look descriptive. Maybe products would be a better key?