What are the best practices for implementing a "control center" on a website using PHP?

Implementing a control center on a website using PHP involves creating a secure login system, restricting access to authorized users, and organizing various functionalities such as user management, content editing, and analytics in a centralized dashboard.

<?php
session_start();

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

// Display control center content
echo "Welcome to the control center!";
?>