What are some strategies for handling navigation within a PHP application while ensuring that users only see relevant content?

To handle navigation within a PHP application while ensuring that users only see relevant content, you can use conditional statements to check the user's role or permissions before displaying certain navigation links or content. This way, users will only have access to content that is appropriate for their role or level of access.

<?php
// Check user role or permissions before displaying navigation links
if($userRole == 'admin'){
    echo '<a href="admin_dashboard.php">Admin Dashboard</a>';
} elseif($userRole == 'user'){
    echo '<a href="user_profile.php">User Profile</a>';
} else {
    echo '<a href="login.php">Login</a>';
}
?>