I am sorry, if I caused any inconvenience. I was able to upgrade to PHP 5.6.9 by following the following instructions (Reference: https://webtatic.com/packages/php56/
To install, first you must add the Webtatic EL yum repository information corresponding to your CentOS/RHEL version to yum:
rpm -Uvh https://mirror.webtatic.com/yum/el7/epel-release.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/web ... elease.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el6/latest.rpm
Now you can install PHP 5.6 (along with an opcode cache) by doing:
yum install php56w php56w-opcache
If you would like to upgrade php to this version it is recommended that you first check that your system will support the upgrade, e.g. making sure any CPanel-like software can run after the upgrade.
Unless you know what you are doing, it is risky upgrading an existing system. It’s much safer to do this by provisioning a separate server to perform the upgrade as a fresh install instead.
If you know what you are doing, you can upgrade PHP by:
yum install yum-plugin-replace
yum replace --enablerepo=webtatic-testing php-common --replace-with=php56w-common
It will likely give you a message “WARNING: Unable to resolve all providers …”. This is normal, and you can continue by tying “y“. You will be given a chance to see what packages will be installed and removed before again being given a chance to confirm.