What are some potential pitfalls to be aware of when modifying form elements in PHP?

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

// Example of sanitizing user input using htmlspecialchars()
$user_input = $_POST['user_input'];
$sanitized_input = htmlspecialchars($user_input);

Keywords

XSS CSRF validation sanitization security

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