phpmapscript geos integration (buffer)

[Nicol Hermann]

Hi List,

i tried the geos buffer integration with the script posted by Assefa in
bug 1327 (#2) (http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1327).
It runs fine with the current cvs version of mapserver but crashes with
the current stable release 4.8.1

Fatal error: Object expected as argument.
in /home/nicol/public_html/mapserver/dev/tmpsym/geosbuffer.php on line
38

Is this feature implemented in the 4.8.1 release? According to the
README file (mapscript/php3) which comes with the release is should be.

shapeobj buffer(width)
   Returns a shape object that has a buffer around the current
   shape object. Only available if php/mapscript is built with GEOS
   library.

Any hints how to use the method with the 4.8.1 release?
Many thanks 
Nicol