The latest hacks include support for WikiPlugins.
to wiki pages within PhpWiki. In this very wiki, the RecentChanges, BackLinks, LikePages and DebugInfo pages are all implemented using plugins. I expect that the search result pages, as well as much ?PhpWikiAdministration will soon be implemented via plugins as well. (I think the oh-so-ugly ?MagicPhpWikiURLs can be replaced by plugins, too.)
Currently, one invokes a plugin by putting something like:
<?''''plugin !BackLinks?>
into a regular wiki-page. That particular example produces as list of pages which link to the current page. Here it is:
(This is great for Category and Topic pages. You can use this to get an automatic in-line listing of pages in the Category or Topic.)
(This is all subject to change.)
Plugins can take certain named arguments (most do). The values of these arguments can be determined four different ways. In order of precedence:
<?plugin BackLinks page=OtherPage ?>
<?plugin BackLinks page ?>
<?plugin BackLinks page||=OtherPage ?>
the current page as the default value for the page argument.