安装的命令行很简单

sudo yum --enablerepo=remi install php

不过如果你没有配置源Repository，就需要首先启动REMI源：

cd /tmp

wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

wget http://mirrors.sohu.com/fedora-epel/6/i386/epel-release-6-8.noarch.rpm

rpm安装

rpm -Uvh remi-release-6.rpm epel-release-6-8.noarch.rpm

然后用remi源来安装php

yum --enablerepo=remi install php

确认正确的版本，回答Y开始安装。

如何查看PHP的版本号：

# php -v

PHP 5.4.30 (cli) (built: Jun 25 2014 15:27:51) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
with Zend Guard Loader v3.3, Copyright (c) 1998-2013, by Zend Technologies

安装成功。