Why is header() causing an internal server error?

Question

I cannot figure out what could be causing this error. My Apache log is not recording any errors in the access log or error log regarding the page, yet somehow whenever I uncomment the header() line I get a 500 Internal Server Error. It can't be coming from PHP's fatal error when content is outputted before header() is called, that wouldn't cause a 500 would it?

header("Location: /offices/page-".ceil($cache->size() / 15));

I tested $cache->size() and it's returning 22, so it should append a 2 to the end of the string and redirect. I did have ob_start() called before the header() but I tried calling ob_end_clean() right before it and it still did nothing...

I even tried putting header("Location: /offices"); at the very beginning of the file and it still gives me a 500.

Answer 1

Try to use a fully formed URL:

header("Location: http://{$_SERVER['HTTP_HOST']}/offices/page-".ceil($cache->size() / 15));

Answer 2

The script continues to execute after your header() call. You need put exit; immediately after it. This shouldn't cause a 500 error, though.

Edit: Evidently this worked - meaning your problem is probably in some related code further down the page?