$_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

Use $.post() for ajax :

$('#confirm').click(function(e){

    e.preventDefault();

    $.post("sessions.php", $.param($("#saveuser").serializeArray()), function(data) { // use this ajax code
       console.log(data);
    });

});