Look here it is already tested on live projects error catcher.

Fatal errors can be catch only by 'register_shutdown_function'

You do not track uncatched Exceptions, it can be done by 'set_exception_handler'

If code runout all memory it will not able to log error, but it you does not catch Fatal errors so it is not your case.

Look here it is already tested on live projects error catcher.

Fatal errors can be catch only by 'register_shutdown_function'

You do not track uncatched Exceptions, it can be done by 'set_exception_handler'

If code runout all memory it will not able to log error, but if you does not catch Fatal errors so it is not your case.