由于linux默认yum源安装的是php 5.1的包，
yum安装php以后查看

rpm -qa php

php-5.1.6-23.2.el5_3

由于有的程序需要使用php5.2以上的版本

于是就找起了资料，终于找到有介绍如下添加一个额外的源：

# rpm –import http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka
# gedit /etc/yum.repos.d/utterramblings.repo
或者直接修改/etc/yum.repos.d/utterramblings.repo  名字可以自己定义要以.repo结尾如abc.repo

在打开的文件中加入以下内容：

[abc]
name=Jason’s Utter Ramblings Repo
baseurl=http://www.jasonlitka.com/media/EL$releasever/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka

执行yum update php 如图所示 ，

# yum update php
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
utterramblings                                           |  951 B     00:00
utterramblings/primary                                   |  39 kB     00:03
utterramblings                                                          140/140
Skipping security plugin, no data
Setting up Update Process
Resolving Dependencies
Skipping security plugin, no data
–> Running transaction check
–> Processing Dependency: php = 5.1.6-23.2.el5_3 for package: php-devel
—> Package php.i386 0:5.2.16-jason.1 set to be updated
–> Processing Dependency: php-common = 5.2.16-jason.1 for package: php
–> Processing Dependency: php-cli = 5.2.16-jason.1 for package: php
–> Running transaction check
—> Package php-cli.i386 0:5.2.16-jason.1 set to be updated
。。。。。。。。
已经有新的php包尅更新
=================================================================
Package               Arch         Version                   Repository   Size
=================================================================
Updating:
php                   i386         5.2.16-jason.1            abc         3.6 M
Installing for dependencies:
mysqlclient15         i386         5.0.91-1.jason.1          abc         2.0 M
Updating for dependencies:
mysql                 i386         5.1.52-jason.1            abc         3.5 M
mysql-bench           i386         5.1.52-jason.1            abc         502 k
mysql-devel           i386         5.1.52-jason.1            abc         120 k
mysql-server          i386         5.1.52-jason.1            abc          13 M
mysql-test            i386         5.1.52-jason.1            abc         7.3 M
php-bcmath            i386         5.2.16-jason.1            abc          67 k
php-cli               i386         5.2.16-jason.1            abc         2.6 M
php-common            i386         5.2.16-jason.1            abc         513 k
php-dba               i386         5.2.16-jason.1            abc         127 k
php-devel             i386         5.2.16-jason.1            abc         557 k
php-gd                i386         5.2.16-jason.1            abc         331 k
php-imap              i386         5.2.16-jason.1            abc         108 k
php-ldap              i386         5.2.16-jason.1            abc          59 k
php-mbstring          i386         5.2.16-jason.1            abc         1.3 M
php-mysql             i386         5.2.16-jason.1            abc         267 k
php-ncurses           i386         5.2.16-jason.1            abc          78 k
php-odbc              i386         5.2.16-jason.1            abc         116 k
php-pdo               i386         5.2.16-jason.1            abc         164 k
php-pgsql             i386         5.2.16-jason.1            abc         159 k
php-snmp              i386         5.2.16-jason.1            abc          44 k
php-soap              i386         5.2.16-jason.1            abc         352 k
php-xml               i386         5.2.16-jason.1            abc         328 k
php-xmlrpc            i386         5.2.16-jason.1            abc         136 k
Transaction Summary
===============================================================
Install      1 Package(s)
Update      24 Package(s)
Remove       0 Package(s)
Total download size: 37 M

Is this ok [y/N]: y
安装 后 重启apache
查看php 目前安装版本
# rpm -qa php
php-5.2.16-jason.1

升级完成后，如果没有php-mbstring-5.2.6-2.el5s2，安装方法：yum install php-mbstring*