Relying on HTML 'required' for simple form validation

Question

My question is simple, I\'m writing a simple login/registration form for my website using HTML, PHP and jQuery.

Is it neccesary to write the form validation in PHP also

Answer 1

Validation on the server is a must

You can pretty things up however by validating on both the client and server so the user gets instant feedback, but yes it is neccesary to do validation in PHP.