I'm working with a RHEL5.1 box that has PHP 5.1.6 installed by default. I need to upgrade PHP to PHP 5.3.x. I've tried several tutorials and have had no luck. Can anyone help me out with this? 
How to install PHP 5.3 on RHEL5
php
add a repo sourse that support php-5.3 you can see this link to know how to install a repo http://blog.famillecollet.com/pages/Config-en[root@redhat~]# yum update php php-* you also can compile php5.3 from sourse