phpbb/phpbb3 — pull request #899 by Fyorl (2012-07-17 16:15:42+00:00)
Title: [ticket/10944] Reverted changes in PHPBB3-10963

is_image now just checks the mimetype reported by the browser
and get_mimetype goes back to being unused.

http://tracker.phpbb.com/browse/PHPBB3-10994

PHPBB3-10944