[pmwiki-users] update a php value via php

[noskule]

hi list
I would like to update a ptv in the users profile page after login. So I 
need a function which I could execute in config.php. Something like

writeptv(pagename, ptv, value)

I did try peters toolbox, but the probleme there is that it can't be 
executed in config php cause it needs stdconfig.php be initialized first.

Does someone have a solution to write/update a ptv rom config.php

thanks for any hints
nos