What are the potential pitfalls of displaying conditional navigation elements in PHP based on user login status?

Potential pitfalls of displaying conditional navigation elements in PHP based on user login status include inadvertently exposing sensitive information if the check for user authentication is not properly implemented. To solve this issue, always validate user authentication securely before displaying any sensitive navigation elements. 

<?php
session_start();

if(isset($_SESSION['user_id'])) {
    // Display navigation elements for authenticated users
    echo '<a href="dashboard.php">Dashboard</a>';
    echo '<a href="logout.php">Logout</a>';
} else {
    // Display navigation elements for non-authenticated users
    echo '<a href="login.php">Login</a>';
    echo '<a href="register.php">Register</a>';
}
?>

Keywords

authentication session management conditional statements user login status security vulnerabilities

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