Tecmint.com has a new tutorial that walks you through the installation of a full LAMP stack (Linux, Apache, MySQL and PHP) on a CentOS or RedHat installation.
This howto guide explains you’ll how to install Apache Server with latest MySQL 5.5.27 and PHP 5.4.7 versions with php required following modules on RHEL 6.3/6.2/6.1/6.0/5.8/5.6, CentOS 6.3/6.2/6.1/6.0/5.8/5.6 and Fedora 12,13,14,15,16,17 systems using Remi repository via Yum tool.
Thankfully, package management has made things a lot simpler than they used to be. Most of the time you're only a few commands away from a working installation (if all you need are the generic setups). They explain what each piece of the installation is and how to set up the custom "Remi" yum repository to get the latest versions of the software - Including PHP 5.4. They show how to stop and start each of the servers (MySQL, Apache) and a few screenshots of what the output of your phpinfo page should look like.