Add additional yum source in CentOS

root@linuxbox ~]# wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/ius-release-1.0-6.ius.el5.noarch.rpm
root@linuxbox ~]# wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/epel-release-1-1.ius.el5.noarch.rpm
root@linuxbox ~]# rpm -Uvh ius-release*.rpm epel-release*.rpm

yum install yum-plugin-replace

yum replace php --replace-with php53