How can the session variable $_SESSION['user_rechte'] be checked for accuracy before the if statement?

To check the accuracy of the session variable $_SESSION['user_rechte'] before the if statement, you can use the isset() function to verify if the variable is set and not null. This helps prevent errors that may occur if the variable is not initialized or set incorrectly. By checking the existence of the session variable before using it in the if statement, you ensure that your code runs smoothly without encountering any unexpected issues.

<?php
// Check if the session variable is set and not null
if(isset($_SESSION['user_rechte'])) {
    // Proceed with the if statement
    if($_SESSION['user_rechte'] == 'admin') {
        // Code for admin user
    } else {
        // Code for non-admin user
    }
} else {
    // Handle the case where the session variable is not set
    echo "User rights not defined.";
}
?>