为CentOS-5.5升级PHP到5.2.10

系统环境：CentOS-5.5-x86

PHP默认版本：5.1.6

因最新版的WordPress需要PHP-5.2.4以上版本，所以不得不升级PHP

1.编辑/etc/yum.repos.d/CentOS-Base.repo文件，将下面的内容添加到文件的末尾：

[CentOS-Testing]
name=CentOS-5 Testing
baseurl=http://dev.centos.org/centos/$releasever/testing/$basearch/
enabled=0
gpgcheck=1
gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing

# 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. 

在CentOS-Base.repo文件中不要启用CentOS-Testing，必要的时候用yum的enablerepo参数就可以了，所以上面enabled参数后面的值是0.

2.检查CentOS-Testing中是否有关于PHP的可用更新；

yum --disablerepo=* --enablerepo=CentOS-Testing check-update php*

3.更新PHP相关的软件

yum --disablerepo=* --enablerepo=CentOS-Testing update php*