here a tiny description that might help to improve dokuwiki a bit or at leas the usage...
We had some problems with dokuwi:
1 ) we had a warning message
Warning: Iinvalid argument supplied for foreach() in usr/local/apache/htdocs/...../inc/html.php on line 901[/color]
2 ) while subscribing to changes or when trying to upload files:
Fatal error:  operator not supported for strings in /usr/local/apache/htdocs/...../inc/infoutils.php on line 210
The cause was :
On the same server the global variable MSG was set by another PHP app.
I do not know PHP very well... so I will not judge this. ;-)
thanks for the cool wiki