CentOS 7使用yum安装PHP5.6

删除旧php包

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 

配置epel源

yum install -y epel-release
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

配置remi源

rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm

安装php5.6.x

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

安装php-fpm

yum install --enablerepo=remi --enablerepo=remi-php56 php-fpm 

配置开机启动服务

systemctl restart php-fpm
systemctl enable php-frm

查看是否安装成功

ps -ef | grep php
netstat -anp | grep 9000

参考：

https://blog.csdn.net/TH_NUM/article/details/78195568