including PHP on Dokuwiki pages
As a newcomer to DokuWiki administration, I didn't know this was an option; thank you for opening my eyes to the possibility, and for adding to the pool of available plugins.
Although I don't yet have a reason to include PHP, could you clarify what you mean by this please?
You can disable show source on PHP-enabled pages.
Do you mean client-side/browser View Source, or is this something server-side, e.g. a link which will show the source of the underlying DokuWiki thispage.txt (or whatever) on the server?