Thanks for your answer.
I modified the CentOS+ RPM/spec file so that you can install PHP5 in parallel to PHP4 (shared PHP pear with PHP4). Additionally, I added a fcgi package which contains a FastCGI enabled PHP binary.
Presently, does CentOS using FastCGI?
You will probably want to disable either /etc/httpd/conf.d/php5.conf or /etc/httpd/conf.d/php.conf because using both modules in parallel is AFAIK not possible.
Will apache still call out php module when php is executed?
Thanks