It appears that the default behaviour is to strip PHP from editor content. In my local out-of-the-box copy of v2.3.2, if I select 'source' mode in the editor and type in something like:
<?php function(); ?>
and then switch to and from source mode, the PHP gets immediately stripped out.
However, if I try the same thing on the demo site ( http://www.fckeditor.net/demo ), the PHP is preserved. Is this simply a config entry that I can't seem to find? This doesn't have anything to do with the ProtectedSource config.
Although for the majority of form entry the default behaviour is absolutely correct, there are some areas where I'd like developers to be able to enter PHP directly into the FCKeditor window (via the source mode).
Any idea how I can enable this? As it works on the demo site, it *must* be possible.