What potential pitfalls should be considered when comparing user inputs to correct answers in a PHP quiz or puzzle scenario?

One potential pitfall when comparing user inputs to correct answers in a PHP quiz or puzzle scenario is case sensitivity. Users may enter answers with different casing than what is expected, leading to incorrect evaluations. To solve this issue, you can convert both the user input and the correct answer to a consistent casing before comparing them.

// Convert both user input and correct answer to lowercase before comparing
$userInput = strtolower($_POST['user_input']);
$correctAnswer = strtolower($correct_answer);

if ($userInput == $correctAnswer) {
    // Correct answer logic
} else {
    // Incorrect answer logic
}