What are some common pitfalls to avoid when validating form input in PHP?

One common pitfall to avoid when validating form input in PHP is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To solve this issue, always sanitize user input using functions like htmlspecialchars() or mysqli_real_escape_string() before using it in your application. 

// Sanitize user input before using it in your application
$username = htmlspecialchars($_POST['username']);
$email = htmlspecialchars($_POST['email']);

// Or using mysqli_real_escape_string for database queries
$username = mysqli_real_escape_string($conn, $_POST['username']);
$email = mysqli_real_escape_string($conn, $_POST['email']);

Keywords

empty isset filter_var htmlspecialchars validation

Related Questions