epel
yum install epel-release
remi
wget http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
yum install remi-release-7.rpm
安装remi后需要
/etc/yum.repos.d/remi.repo把对应的enabled设为1来开启
remi包含php5.4,php5.5,php5.6
rpmforge
wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el7.rf.x86_64.rpm
yum install rpmforge-release-0.5.3-1.el7.rf.x86_64.rpm