This issue has been moved from the zendframework repository as part of the bug migration program as outlined here - http://framework.zend.com/blog/2016-04-11-issue-closures.html

Original Issue: https://api.github.com/repos/zendframework/zendframework/issues/7518
User: @ThaDafinser
Created On: 2015-05-13T09:08:48Z
Updated At: 2015-11-06T21:39:31Z
Body
If a fatal error comes up, the register_shutdown_function is called like wanted here:
https://github.com/zendframework/zf2/blob/master/library/Zend/Log/Logger.php#L617-L643

But the writers $writer->shutdown() function never gets called, so e.g. an eMail wont be send.
https://github.com/zendframework/zf2/blob/master/library/Zend/Log/Writer/Mail.php#L173