Aaaarrrgh! Hard to trace programming errors.

I just spent an hour debugging the old “never forget to exit after sending your header redirect” error.
PEBKAC (my chair and my keyboard )…

SAFETY TIP:
Whenever you have code that looks like this:

<?php
header('Location: '.phpself());
?>

it must be followed by

<?php
exit;
?>

to prevent hard to track down unexpected results.