Thanks again Altrea. In my case, it's not joomla that is involved, but mediawiki, and and extension for it called dynamicpagelist (third party).
You're probably right that the issue has to do with in settings in mediawiki. But it seems odd that when I change the php.ini settings for error_reporting, phpinfo reflects the change when I have the line rem'd, but does not reflect the change between other settings as expected.
I'm still not sure of the syntax anyways. I've used both error_reporting = E_ALL | E_STRICT and error_reporting = E_ALL & ~E_NOTICE & ~E_STRICT. Which syntax (~ or |) is correct for this usage?