What are the recommended methods for handling user permissions and access control when implementing PHP functionality to update database entries?

When implementing PHP functionality to update database entries, it is important to handle user permissions and access control to ensure that only authorized users can make changes. One recommended method is to use session variables to store user roles or permissions, and then check these permissions before allowing updates to the database.

// Check user permissions before updating database entry
session_start();

if(isset($_SESSION['user_role']) && $_SESSION['user_role'] == 'admin'){
    // User has admin permissions, allow database update
    // Your database update code here
} else {
    // User does not have admin permissions, show error message or redirect
    echo "You do not have permission to update database entries.";
}