Keeping your Linux server up-to-date with the latest packages is no small task. One of the most popular repository for RHEL, Centos and Scientific Linux among others is EPEL, Extra Packages for Enterprise Linux. EPEL is a Fedora Special Interest Group that creates, maintains, and manages a high quality set of additional packages for Enterprise Linux.
If you wish to upgrade your PHP, MySQL and HTTP to the latest available binary packages, you may opt to install EPEL and remi repositories on your linux system.
On Centos 6.x: