What are the key functionalities to consider when creating a CMS with PHP?

When creating a CMS with PHP, it is important to consider key functionalities such as user authentication, content management, role-based access control, and search functionality. These features will help ensure that the CMS is secure, user-friendly, and efficient for managing and displaying content.

// Example PHP code snippet for implementing user authentication in a CMS

// Check if user is logged in
session_start();
if(!isset($_SESSION['user_id'])) {
    header("Location: login.php");
    exit();
}

// Display user-specific content
echo "Welcome, ".$_SESSION['username']."!";