yum install yum-priorities
rpm -Uvh http://mirrors.ustc.edu.cn/fedora/epel/5/x86_64/epel-release-5-4.noarch.rpm
rpm -Uvh http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/ius-release-1.0-10.ius.el5.noarch.rpm
yum install php54 php54-common php54-devel