So I have a form for my register system. When the form submits and there's errors, (like 'Enter a username first!' or 'You must provide a password!') it successfully refreshes the page and shows those errors.
HOWEVER, when the form submits and the user has filled out all of the data, and there is NO errors, the form goes to a white page. I looked in the source, and all that shows is the javascript at the top of my page, but it looks like no PHP/HTML is being executed. What is happening?!
-- EDIT --
Okay, so I turned errors on, and I'm getting stuff like this:
Notice: Use of undefined constant username - assumed 'username' in /home/content/04/7195304/html/header.php on line 54
