What are the potential pitfalls of using in_array and array_replace functions for updating a shopping cart in PHP?

When using in_array to check if an item is already in the shopping cart, it may not work as expected if the item is an associative array or object. To solve this, you can use array_search instead. Similarly, when using array_replace to update the quantity of an item in the shopping cart, it may not work correctly if the item is an associative array or object. To fix this, you can manually loop through the array and update the quantity. 

// Check if item is already in the shopping cart using array_search
$key = array_search($itemToAdd, $_SESSION['cart']);

if($key !== false) {
    // Item is already in cart, update quantity
    $_SESSION['cart'][$key]['quantity'] += $quantityToAdd;
} else {
    // Item is not in cart, add it
    $_SESSION['cart'][] = $itemToAdd;
}

Keywords

in_array array_replace shopping cart updating PHP

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