Description:
------------
In documentation http://us2.php.net/restore_error_handler is note:

> Calling restore_error_handler() from the error_handler function is ignored.

I've tried it in all PHP versions from 5.3.0 to 5.5.6 and it seems that it works and is not ignored.

Test script:
---------------
<?php

set_error_handler(function() {
	echo 'one';
});

set_error_handler(function() {
	echo 'two';
    restore_error_handler();
});

trigger_error('', E_USER_NOTICE);
trigger_error('', E_USER_NOTICE);