Update PHP to 5.2.9

#vi /etc/yum.repos.d/centos.repo

append below to file :
[c5-testing]
name=CentOS-5 Testing
baseurl=http://dev.centos.org/centos/5/testing/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing

save file
#yum clean all
#yum info php
#yum update php*