$_POST is not working in ajax form submit?

Question

When I try to check user input name is already exist by ajax form submit !But it only get Undefined index: username in sessions.php ,what is missin

Answer 1

You need to change your script:

Try using new FormData instead of .serialize().

Note : You are used contentType to false that mean jQuery not to add a Content-Type header. You are using jQuery's .serialize() method which creates a text string in standard URL-encoded notation. You need to pass un-encoded data when using "contentType: false".