I'm running both PHP4 and PHP5 in two different virtual directories in IIS.
(That means that different virtual dirs use different ISAPI .dll-s for
.php files.)
Everything works fine, except php.ini -- it is obvious that I can't
use a shared php.ini. But there seems to be no way of specifying
different .ini-s for the separate ISAPI dll-s. The .ini that lies in
the same dir as the .dll won't be used.
Currently I'm running with the defaults, with no .ini specified :(
Please consider adding the .dll load path to the .ini search path (I
doubt if it's possible) or propose something to overcome the problem
(PHP4RC and PHP5RC instead of PHPRC would do the trick, but a generic
solution should be preferred as people may want to run PHP4 with
different configurations in a single IIS also).