Execute PHP in .htaccess

[kristianblom]

I don't know if this can be done, but I'll ask anyway.

How can I by using an htaccess file execute a PHP script before loading a requested file.

My wish is to avoid puting this PHP script in all my files, and instead make .htaccess do the job for me. Based on session variables I want to make decissions on where to "send" the user?

Thanks guys!