phpbb/phpbb3 — pull request #440 by nickvergessen (2011-10-21 08:46:20+00:00)
Title: [ticket/9066] Disallow some database prefix to prevent same errors and problems

With this patch database prefixes must not be empty and only contain
alphanumeric characters, numbers and underscores.

http://tracker.phpbb.com/browse/PHPBB3-9066