Centos6、7 PHP5.4 5.5 5.6安装

https://www.mojowill.com/geek/howto-install-php-5-4-5-5-or-5-6-on-centos-6-and-centos-7/

https://blog.kuoruan.com/69.html

https://segmentfault.com/a/1190000009330656