If your script exceeds the maximum execution time, and terminates thusly:
Fatal error: Maximum execution time of 20 seconds exceeded in - on line 12
The registered shutdown functions will still be executed.
I figured it was important that this be made clear!
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Manual Page -- http://www.php.net/manual/en/function.register-shutdown-function.php
Edit Note -- http://master.php.net/manage/user-notes.php?action=edit+33575
Delete Note -- http://master.php.net/manage/user-notes.php?action=delete+33575&report=yes
Reject Note -- http://master.php.net/manage/user-notes.php?action=reject+33575&report=yes