Tecadmin published a guide about installing phpMyAdmin with Apache on CentOS 8.
How To Install phpMyAdmin with Apache on CentOS 8
The current phpMyAdmin version is compatible with PHP 7.1 and newer and MySQL 5.5 and newer. This tutorial will help you with the installation and configuration of phpMyAdmin on the CentOS 8 Linux system. Prerequsities We are assuming you already have installed the MySQL server on CentOS 8 operating system.
How To Install phpMyAdmin with Apache on CentOS 8