phpbb/phpbb3 — pull request #460 by nickvergessen (2011-11-13 15:35:58+00:00)
Title: [ticket/7138] Allow simple header and footer for trigger_error() messages

Adds a template condition using S_SIMPLE_MESSAGE that must be set to true
before calling trigger_error() which will automatically use the simple
header and footer files in the template directory instead of the overall
header and footer files.

http://tracker.phpbb.com/browse/PHPBB3-7138

based on https://github.com/phpbb/phpbb3/pull/312