首先，安装 composer

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"

php composer-setup.php --install-dir=/usr/local/bin --filename=composer

通过 composer 安装 phpmyadmin（注意安装所需的php扩展：mbstring/zip/curl/xml 等）

composer create-project phpmyadmin/phpmyadmin