有些时候VPS默认为5.1的PHP版本，现在的很多程序都不在兼容php5.1的了，所以我们要升级PHP到最新的版本。
检查PHP组件
rpm -qa |grep php
我这里是PHP5.1。
php-odbc-5.1.6-44.el5_10
php-xmlrpc-5.1.6-44.el5_10
wbm-php-pear-1.5-1
php-common-5.1.6-44.el5_10
php-pdo-5.1.6-44.el5_10
php-cli-5.1.6-44.el5_10
php-snmp-5.1.6-44.el5_10
php-imap-5.1.6-44.el5_10
php-pgsql-5.1.6-44.el5_10
php-mbstring-5.1.6-44.el5_10
php-gd-5.1.6-44.el5_10
php-devel-5.1.6-44.el5_10
php-pear-1.4.9-8.el5
php-5.1.6-44.el5_10
php-xml-5.1.6-44.el5_10
php-mysql-5.1.6-44.el5_10
centos-php-new-1
新增开发库
第二步，我们添加官方新增的开发库，先新建一个repo文件
vim /etc/yum.repos.d/CentOS-Testing.repo
复制以下内容，保存并退出。
# CentOS-Testing:
# !!!! CAUTION !!!!
# This repository is a proving grounds for packages on their way to CentOSPlus and CentOS Extras.
# They may or may not replace core CentOS packages, and are not guaranteed to function properly.
# These packages build and install, but are waiting for feedback from testers as to
# functionality and stability. Packages in this repository will come and go during the
# development period, so it should not be left enabled or used on production systems without due
# consideration.
[c5-testing]
name=CentOS-5 Testing
baseurl=http://dev.centos.org/centos/$releasever/testing/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing
includepkgs=php*
也可以复制这里的内容：http://dev.centos.org/centos/5/CentOS-Testing.repo
升级PHP组件
这里通过官方的开发库后我们可以使用简单命令升级到最新版本的php。
yum update
重启Apache
我们升级后，重启一下Apache服务器。
service httpd restart
再次检查PHP组件
rpm -qa |grep php
centos-php-new-2
这个时候我们就成功将PHP升级到了最新的版本了。