Minscale doesn't work correct with php-mapscript

[praktikant.agi@…]

There are some problems with the minscale in php_mapscript. Minscale is set in 
the WEB Object of the mapfile to 10.000.
Now when I try to zoom in with zoomrectangle to a scale bigger then 1:10.000 
(eg 1:8000 it doesn't matter which scale) I get back a map with a scale around 
1:14.000.Same problem with zoomscale and zoompoint.
Similar problem with setextent. I set an extent with setextent which is 
definitely bigger then 1:10000 (sth around 1:5000). But mapscript seems to 
ignore that. I get a map which has the extent I set and the scale 1:5000 even 
if i have a minscale 1:10000.   
I use php-mapscript 4.10.1 

You can download my examples from http://www.sogis1.so.ch/sogis/internet/
minscale/minscale.html

Thanks