What are some common pitfalls when trying to evaluate user selections in PHP?

One common pitfall when evaluating user selections in PHP is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To prevent this, always use functions like `htmlspecialchars()` or `mysqli_real_escape_string()` to sanitize user input before using it in your code.

// Sanitize user input using htmlspecialchars
$userSelection = htmlspecialchars($_POST['userSelection']);