1. Enable the REMI repo and Upgrade software

yum –-enablerepo=remi install mysql

The reason for using install mysql is that the yum software utility will install/upgrade all dependencies to ensure that all the software pieces work together. It will also upgrade all the related PHP packages (e.g. php-gd, php-devel, php-mbstring, php-cli, etc) from version 5.3 to 5.4

2. Run Mysql Upgrade

mysql_upgrade -u root -p

3. Edit /etc/httpd/conf.d/php.conf


<FilesMatch \.php$>
SetHandler application/x-httpd-php


AddHandler php5-script .php

I also had to run the following to get phpmyadmin to work

yum --enablerepo=remi install php-mbstring
How To: Virtualmin CentOS Upgrade PHP 5.3 to 5.4
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