We successfully run mediawiki for a year with version 1.9.3 (with an extension function defining these hooks: AutoAuthenticate, SpecialPage_initList, UserLogoutComplete).
Now we tried to upgrade to 1.12.0. The upgrade process seemed to be OK, since the installer completed with "Installation successfull". However, it does not work; the error log states: PHP Fatal error: Class 'DOMDocument' not found in /magwien/var/gondor-phpserver/html/m13wiki/includes/Preprocess or_DOM.php on line 566
Best regards Michael Gsandtner Magistrat der Stadt Wien