if($_POST['username'] == "admin" && $_POST['password'] == "password"){ header("Location: dashboard.php"); exit; } else{ echo "Invalid username or password"; }
if(empty($_POST['email'])){ echo "Email is required"; } else{ //process submit form }There are several PHP packages and libraries available for user validation, such as PHP's built-in filter_var() function, Laravel's authentication system, and Symfony's security component. The choice of library or package depends on the specific needs of the application and the framework used.