> Can someone tell me whether under linux, the php.exe (equivalent) is loaded
> on each request or if it is like an ISAPI dll under Win32 which is cached
> for the application?

that's certainly _not_ a Firebird question, but anyway:
It depends on your configuration. If you install PHP to work via CGI, it is
loaded upon each request (but that's no Windows thing, all other systems load
CGI upon each request if it is set to work as CGI).
However if you run PHP as a module, it is started once and remains in memory,
waiting for requests. PHP comes with modules for Apache, Apache2 (still
experimental) and IIS.

Regards
Christian