Php behind a proxy

Hi ! I would like to have your feedback on a configuration @ work : - Apache2 + PHP4 + Mysql on a linux box - Linux box with a python proxy server for NTLM auth - Internet Acces secured with a proxy server (Microsoft ISA, not managed by me) I plan to grap RSS feed from Internet from a PHP script running on my linux box. The trouble is that my script is not able to acces to Internet because of the ISA proxy. So how can a manage this without making changes on the ISA proxy ? Is there something that can be configured in php.ini file ? (I look for this information but I don t find it yet) For your information, from a shell, I can "wget" internet page via the python proxy and http_proxy env variable. Thx ! Raphael.