What common mistakes are beginners likely to make when integrating functions like editing and deleting items in a PHP mini-shop with sessions?

One common mistake beginners make when integrating functions like editing and deleting items in a PHP mini-shop with sessions is not properly checking if the user is authenticated before allowing these actions. This can lead to unauthorized users being able to modify or delete items in the shop. To solve this issue, always make sure to check if the user is logged in and has the necessary permissions before allowing any editing or deleting actions to take place.

// Check if user is logged in before allowing editing or deleting items
session_start();

if(!isset($_SESSION['user_id'])) {
    // Redirect to login page or display an error message
    header("Location: login.php");
    exit();
}

// Continue with editing or deleting item logic here