The current php version with CentOS is 5.1.6. Even epel repository’s php is 5.1.6. I am disappointed with epel slow up-to-date, but I found three 3rd party repositories to update php. Installation of these repositories are slightly diffferent.
remi repo has php 5.2.9. To install, just run
rpm -Uvh http://rpms.famillecollet.com/enterprise/5/remi/x86_64/remi-release-5-7.el5.remi.noarch.rpm
atomic repo has php 5.2.9. To install, download this script and run it
james’ utterramblings repo has php 5.2.6. To install, import GPG key first
rpm --import http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka
create a repo file manually with the following content
name=Jason's Utter Ramblings Repo