1、查看centos 版本
lsb_release -a
LSB Version: :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID: CentOS
Description: CentOS release 6.9 (Final)
Release: 6.9
Codename: Final
2、切换yum 源
.检查当前安装的PHP包
yum list installed | grep php
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如果有安装的PHP包，先删除他们
yum remove php.x86_64 php-cli.x86_64 php-common.x86_64 php-gd.x86_64 php-ldap.x86_64 php-mbstring.x86_64 php-mcrypt.x86_64 php-mysql.x86_64 php-pdo.x86_64
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配置yum源
CentOS 7.0的源。
yum install epel-release
rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
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使用yum list命令查看可安装的包(Packege)
yum list --enablerepo=remi --enablerepo=remi-php56 | grep php
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安装PHP5.6.x
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
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2用PHP命令查看版本。
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
1安装PHP-fpm
yum install --enablerepo=remi --enablerepo=remi-php56 php-fpm
1在这里安装的版本是PHP5.6.13。
从PHP5.5开始PHP代码缓存从APC变成了Zend OPcache了。
重新启动服务：
在 CentOS 7 系统上:
$ sudo systemctl restart httpd
$ sudo systemctl restart php-fpm
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原文：https://blog.csdn.net/TH_NUM/article/details/78195568