How can session management be effectively utilized to ensure consistent user authentication across restricted pages in a PHP web interface?

To ensure consistent user authentication across restricted pages in a PHP web interface, session management can be effectively utilized. By storing user authentication status in a session variable upon successful login, and checking this variable on restricted pages, you can control access to these pages based on the user's authentication status. 

```php
// Start the session
session_start();

// Check if the user is logged in
if (!isset($_SESSION['logged_in']) || $_SESSION['logged_in'] !== true) {
    // Redirect to the login page if not logged in
    header("Location: login.php");
    exit();
}
```
This code snippet demonstrates how to check if a user is logged in by verifying the 'logged_in' session variable. If the variable is not set or is not true, the user is redirected to the login page.

Keywords

session management user authentication restricted pages PHP web interface consistent

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