[CentOS] php5 rpm to be installed in parallel with php4?

Hi,

I'm looking for a php5 rpm which I can install in parallel with php4. Therefore, 
the centosplus rpm is (AFAIK) not usable for me as it replaces php4.

Does centos provide an php5 rpm which does not touch my php4? Is there a 
matching srpm on web?

Sorry, if this question is a FAQ. Thanks for your help :)

fs