前言：因为实验环境要搭建php5，我选择了php5.2.17，结果发现phpmyadmin不支持，查找了一番发现PHP版本不同需要的phpMyAdmin版本也不同。而我安装的phpMyAdmin4.8.5在php5.2.17下就不支持。
于是参考了这篇文章所整理的资料，重新安装了php5.5.9版本，问题解决。 http://blog.sina.com.cn/s/blog_65d50aab0102yz9f.html
不同版本phpMyAdmin对应的php版本：
phpMyAdmin4.9.0 Current version compatible with PHP 5.5 to 7.3 and MySQL 5.5 and newer.
phpMyAdmin4.8.0 Older version compatible with PHP 5.5 to 7.2 and MySQL 5.5 and newer. Was supported until June 4, 2019.
phpMyAdmin4.6.0-4.7.0 Older version compatible with PHP 5.5 to 7.1 and MySQL 5.5 and newer. Was supported until April 1, 2017.
phpMyAdmin4.5.0 Older version compatible with PHP 5.5 to 7.0 and MySQL 5.5. Was supported until April 1, 2016.
phpMyAdmin4.4.0 Older version compatible with PHP 5.3.7 to 7.0 and MySQL 5.5. Was supported until October 1, 2016.
phpMyAdmin4.1.0-4.3.0 Older version compatible with PHP 5.3 and MySQL 5.5. Was supported until October 1, 2015.
phpMyAdmin4.0.0 Older version compatible with PHP 5.2 and MySQL 5. Does not support PHP 5.5 or newer. Was supported until April 1, 2017.
新旧版本phpMyAdmin下载地址： https://www.phpmyadmin.net/files/