wget http://rpms.famillecollet.com/enterprise/6/remi/x86_64/remi-release-6.5-1.el6.remi.noarch.rpm
rpm -Uvh remi-release-6.5-1.el6.remi.noarch.rpm
yum --enablerepo=remi-php54,remi update php
refer: http://snippets.khromov.se/update-php-5-5-from-remi-repo-on-centos-6/