1. 安装remi-release包
wget http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-2.noarc...
wget http://rpms.famillecollet.com/el5.i386/remi-release-5-4.el5.remi.noarch.rpm
rpm -Uvh remi-release-5*.rpm epel-release-5*.rpm
2. 配置YUM
cd /etc/yum.repos.d
wget http://rpms.famillecollet.com/remi-enterprise.repo
/etc/yum.repos.d里面，另外有一个remi.repo，和remi-enterprise.repo实际是一样的。
3. 安装PHP 5.2.5
yum --enablerepo=remi install php
升级:
yum --enablerepo=remi update php*
第一次安装、升级的时候，需要Remi相应的GPG Key:
wget http://rpms.famillecollet.com/RPM-GPG-KEY-remi
rpm --import RPM-GPG-KEY-remi
4. 重启动Httpd
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