CentOS 6 默认安装的 PHP 版本是 5.3，但现在很多应用对于 LAMP 中，PHP 的版本最低 5.4，所以本篇文章的主要内容是，如何升级 PHP5.3 到 5.4 以及更高版本
实验环境：CentOS 6.4
解决办法是采用了 remi 源仓库已经适配的相应 php 版本
经过测试，该升级办法同样适用目前 CentOS 6.x 所有版本
安装 Remi 源
# 因为remi依赖epel源仓库，所有我们要先安装它。
[root@visionet8 ~]# yum install -y epel-release
[root@visionet8 ~]# wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
[root@visionet8 ~]# rpm -Uvh remi-release-6.rpm
2. 我们看下 Remi 的的 yum 配置文件
# Repository: http://rpms.remirepo.net/
# Blog: http://blog.remirepo.net/
# Forum: http://forum.remirepo.net/
[remi]
name=Remi's RPM repository for Enterprise Linux 6 - $basearch
baseurl=http://rpms.remirepo.net/enterprise/6/remi/$basearch/
#mirrorlist=http://rpms.remirepo.net/enterprise/6/remi/mirror
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
[remi-php55]
name=Remi's PHP 5.5 RPM repository for Enterprise Linux 6 - $basearch
#baseurl=http://rpms.remirepo.net/enterprise/6/php55/$basearch/
mirrorlist=http://rpms.remirepo.net/enterprise/6/php55/mirror
# NOTICE: common dependencies are in "remi-safe"
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
[remi-php56]
name=Remi's PHP 5.6 RPM repository for Enterprise Linux 6 - $basearch
#baseurl=http://rpms.remirepo.net/enterprise/6/php56/$basearch/
mirrorlist=http://rpms.remirepo.net/enterprise/6/php56/mirror
# NOTICE: common dependencies are in "remi-safe"
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
经过测试，启用 remi 源之后，默认情况下 php 版本为 5.4，这时我们只需要升级 php 即可。
[root@visionet8 html]# yum update -y php*
Failed to set locale, defaulting to C
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* epel: mirrors.ustc.edu.cn
* extras: mirrors.aliyun.com
* remi-safe: mirrors.tuna.tsinghua.edu.cn
* updates: mirrors.cn99.com
remi | 2.9 kB 00:00
remi/primary_db | 1.6 MB 00:05
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package php.x86_64 0:5.3.3-48.el6_8 will be updated
---> Package php.x86_64 0:5.4.45-12.el6.remi will be an update
---> Package php-cli.x86_64 0:5.3.3-48.el6_8 will be updated
---> Package php-cli.x86_64 0:5.4.45-12.el6.remi will be an update
---> Package php-common.x86_64 0:5.3.3-48.el6_8 will be updated
---> Package php-common.x86_64 0:5.4.45-12.el6.remi will be an update
---> Package php-gd.x86_64 0:5.3.3-48.el6_8 will be updated
---> Package php-gd.x86_64 0:5.4.45-12.el6.remi will be an update
--> Processing Dependency: libt1.so.5()(64bit) for package: php-gd-5.4.45-12.el6.remi.x86_64
---> Package php-mcrypt.x86_64 0:5.3.3-4.el6 will be updated
---> Package php-mcrypt.x86_64 0:5.4.45-12.el6.remi will be an update
---> Package php-mysql.x86_64 0:5.3.3-48.el6_8 will be updated
---> Package php-mysql.x86_64 0:5.4.45-12.el6.remi will be an update
---> Package php-pdo.x86_64 0:5.3.3-48.el6_8 will be updated
---> Package php-pdo.x86_64 0:5.4.45-12.el6.remi will be an update
--> Running transaction check
---> Package t1lib.x86_64 0:5.1.2-6.el6_2.1 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
==========================================================================================================
Package Arch Version Repository Size
==========================================================================================================
Updating:
php x86_64 5.4.45-12.el6.remi remi 2.8 M
php-cli x86_64 5.4.45-12.el6.remi remi 4.1 M
php-common x86_64 5.4.45-12.el6.remi remi 968 k
php-gd x86_64 5.4.45-12.el6.remi remi 152 k
php-mcrypt x86_64 5.4.45-12.el6.remi remi 60 k
php-mysql x86_64 5.4.45-12.el6.remi remi 145 k
php-pdo x86_64 5.4.45-12.el6.remi remi 129 k
Installing for dependencies:
t1lib x86_64 5.1.2-6.el6_2.1 base 160 k
Transaction Summary
==========================================================================================================
Install 1 Package(s)
Upgrade 7 Package(s)
Total download size: 8.5 M
Downloading Packages:
(1/8): php-5.4.45-12.el6.remi.x86_64.rpm | 2.8 MB 00:07
(2/8): php-cli-5.4.45-12.el6.remi.x86_64.rpm | 4.1 MB 00:06
(3/8): php-common-5.4.45-12.el6.remi.x86_64.rpm | 968 kB 00:02
(4/8): php-gd-5.4.45-12.el6.remi.x86_64.rpm | 152 kB 00:01
(5/8): php-mcrypt-5.4.45-12.el6.remi.x86_64.rpm | 60 kB 00:00
(6/8): php-mysql-5.4.45-12.el6.remi.x86_64.rpm | 145 kB 00:00
(7/8): php-pdo-5.4.45-12.el6.remi.x86_64.rpm | 129 kB 00:01
(8/8): t1lib-5.1.2-6.el6_2.1.x86_64.rpm | 160 kB 00:00
----------------------------------------------------------------------------------------------------------
Total 338 kB/s | 8.5 MB 00:25
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
Updating : php-common-5.4.45-12.el6.remi.x86_64 1/15
Updating : php-cli-5.4.45-12.el6.remi.x86_64 2/15
Updating : php-pdo-5.4.45-12.el6.remi.x86_64 3/15
Installing : t1lib-5.1.2-6.el6_2.1.x86_64 4/15
Updating : php-gd-5.4.45-12.el6.remi.x86_64 5/15
Updating : php-mysql-5.4.45-12.el6.remi.x86_64 6/15
Updating : php-5.4.45-12.el6.remi.x86_64 7/15
Updating : php-mcrypt-5.4.45-12.el6.remi.x86_64 8/15
Cleanup : php-5.3.3-48.el6_8.x86_64 9/15
Cleanup : php-mysql-5.3.3-48.el6_8.x86_64 10/15
Cleanup : php-pdo-5.3.3-48.el6_8.x86_64 11/15
Cleanup : php-cli-5.3.3-48.el6_8.x86_64 12/15
Cleanup : php-gd-5.3.3-48.el6_8.x86_64 13/15
Cleanup : php-mcrypt-5.3.3-4.el6.x86_64 14/15
Cleanup : php-common-5.3.3-48.el6_8.x86_64 15/15
Verifying : php-mcrypt-5.4.45-12.el6.remi.x86_64 1/15
Verifying : t1lib-5.1.2-6.el6_2.1.x86_64 2/15
Verifying : php-common-5.4.45-12.el6.remi.x86_64 3/15
Verifying : php-gd-5.4.45-12.el6.remi.x86_64 4/15
Verifying : php-cli-5.4.45-12.el6.remi.x86_64 5/15
Verifying : php-pdo-5.4.45-12.el6.remi.x86_64 6/15
Verifying : php-mysql-5.4.45-12.el6.remi.x86_64 7/15
Verifying : php-5.4.45-12.el6.remi.x86_64 8/15
Verifying : php-5.3.3-48.el6_8.x86_64 9/15
Verifying : php-gd-5.3.3-48.el6_8.x86_64 10/15
Verifying : php-cli-5.3.3-48.el6_8.x86_64 11/15
Verifying : php-pdo-5.3.3-48.el6_8.x86_64 12/15
Verifying : php-common-5.3.3-48.el6_8.x86_64 13/15
Verifying : php-mysql-5.3.3-48.el6_8.x86_64 14/15
Verifying : php-mcrypt-5.3.3-4.el6.x86_64 15/15
Dependency Installed:
t1lib.x86_64 0:5.1.2-6.el6_2.1
Updated:
php.x86_64 0:5.4.45-12.el6.remi php-cli.x86_64 0:5.4.45-12.el6.remi
php-common.x86_64 0:5.4.45-12.el6.remi php-gd.x86_64 0:5.4.45-12.el6.remi
php-mcrypt.x86_64 0:5.4.45-12.el6.remi php-mysql.x86_64 0:5.4.45-12.el6.remi
php-pdo.x86_64 0:5.4.45-12.el6.remi
Complete!
测试
[root@visionet8 html]# php -v
PHP 5.4.45 (cli) (built: Sep 19 2016 15:31:07)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
php 5.5 和 php5.6
若要升级到 5.5 或 5.6，根据 remi 源的配置文件，将 php5.5 的 enable 参数设置为 1，并将默认 enable 修改为 0，然后
yum update php*即可。
5. php 7
安装完成 之后发现，在安装 remi 源之后，在
/etc/yum.repos.d除了remi.repo之外，还有remi-php70.repo和remi-php71.repo，测试下，如果要升级到 php7，可以打开相应源仓库的配置文件，之后升级即可。 以上功能在升级时，要考虑其他组件的版本兼容性，不要盲目升级。