[PHP-INSTALL] Can Apache forward all requests to PHP?

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I'm trying to set up a server that will take every single request, no  
matter what it looks like, and hand it off to a PHP script. Right now  
I've accomplished this by sending 404 Not Found errors to a php page.  
But this isn't ideal, because they show up as errors in the server  
log. Does anybody know how to do this? It must be possible because  
PHP's own site seems to be doing it.
Thank you