PHP 5.3 on CentOS5.x

ให้ทำการ update repo

rpm -ivh http://repo.webtatic.com/yum/centos/5/`uname -i`/webtatic-release-5-1.noarch.rpm

Now you can install php by doing:
yum --enablerepo=webtatic install php


Or update an existing installation of php, which will also update all of the other php modules installed:
yum --enablerepo=webtatic update php

If this does not work correctly, try disabling all other repositories
while installing/updating, by adding the –disablerepo=* option. This
will stop other dependencies from being installed, so you may want to
install them first.

yum --disablerepo=* --enablerepo=webtatic update php
ref : http://www.webtatic.com/blog/2009/06/php-530-on-centos-5/