suexec, php and user directories

Hello,

I have a php script (working fine) that runs suexec from user
directories. I really don't want to have to put a copy in thousands
of user directories, so I'm wondering if I can put one copy in our
document root, authenticate the user, then run the script suexec as
that user? I'm thinking an alias may work, but I'm wondering how to
approach this task? TIA...

Rick