How can PHP sessions be effectively utilized to track user progress in a quiz application like the one described in the forum thread?

To track user progress in a quiz application using PHP sessions, you can store the current question number and the user's score in session variables. Each time a user answers a question, you can update these session variables accordingly. This way, you can keep track of the user's progress throughout the quiz.

session_start();

// Check if session variables for question number and score exist, if not, initialize them
if (!isset($_SESSION['question_number'])) {
    $_SESSION['question_number'] = 1;
}

if (!isset($_SESSION['score'])) {
    $_SESSION['score'] = 0;
}

// Update session variables after user answers a question
if (isset($_POST['answer'])) {
    // Check if the answer is correct and update score
    if ($_POST['answer'] == $correct_answer) {
        $_SESSION['score']++;
    }
    
    // Move to the next question
    $_SESSION['question_number']++;
}