CentOS上安装PHP5.6

1.配置yum源
追加CentOS 6.5的epel及remi源：

# rpm -Uvh http://ftp.iij.ad.jp/pub/linux/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

以下是CentOS 7.0的源：

# yum install epel-release
# rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm

2.使用yum list命令查看可安装的包(Packege)；

# yum list --enablerepo=remi --enablerepo=remi-php56 | grep php

3.安装PHP5.6
yum源配置好了，下一步就安装PHP5.6；

# yum install --enablerepo=remi --enablerepo=remi-php56 php php-opcache php-devel php-mbstring php-mcrypt php-mysqlnd php-phpunit-PHPUnit php-pecl-xdebug php-pecl-xhprof

用PHP命令查看版本。

复制代码# php --version

PHP 5.6.0 (cli) (built: Sep  3 2014 19:51:31)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies
    with Xdebug v2.2.5, Copyright (c) 2002-2014, by Derick Rethans

在这里安装的版本是PHP5.6.0
对从PHP5.5开始PHP代码缓存从APC变成了Zend OPcache了。
补充：可用此方式进行PHP升级。