1. yum install epel-release
2. wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
3. rpm -Uvh remi-release-6*.rpm
4. yum repolist (to see what you have installed)
5. vi /etc/yum.repos.d/remi.repo and enable the version of php you want to install.
6. yum update php