You have to recompile apache with the new PHP module.
The following instructions are for Apache 1, so you have to alter them as needed:
Go to the http/apache directory and view config.status
You should see a line with something like this:
--activate-module=src/modules/php4/libphp4.a
Make sure that libphp4.a, or whatever PHP module(s) may be listed, are in the given path. If not - copy them from the PHP directory. You also may want to check the date on the PHP modules to make sure that they are the new onces that PHP just added. If not, copy the ones from PHP there.
uninstall:
make clean
configure:
./config.status
compile
make
stop apache
bin/apachectl stop
install:
make install
start apache:
bin/apachectl start