php.ini for every vhost

ooops, by mistake "I replied to author", sorry Klepr.

I am also trying to use a seperate php.ini file for each vhost. Or, a
php parameter in vhost definition to override default value, but it is
not taking effect.
I am looking for a good resource that explains the procedure. Also,
could anyone tell me where to get the manual you are talking about?

Thanks.

.