server {
        listen       80;
        server_name  phpmyadmin.lezi.com;
        location / {
            root   /var/www/html/phpMyAdmin;
            index  index.php;
        }
            location ~ \.php{
                        root  /var/www/html/phpMyAdmin;
                        fastcgi_pass www.sgfblog.com:9000;
                        fastcgi_index index.php;
                        fastcgi_param SCRIPT_FILENAME /var/www/html/phpMyAdminfastcgi_script_name;
                        fastcgi_param  PATH_INFO $request_uri;
                        include fastcgi_params;
           }
   }

上面配置中可以看出路径非常冗余，如过修改路径需要改三个地方，
其实可以set一个变量，将路径写入变量，这样就下次修改的时候就只需要修改1个变量就好了。如下：

server {
        listen       80;
        server_name  phpmyadmin.lezi.com;
        set root '/var/www/html/phpMyAdmin';
        location / {
            rootroot;
            index  index.php;
        }
            location ~ \.php{
                        rootroot;
                        fastcgi_pass www.sgfblog.com:9000;
                        fastcgi_index index.php;
                        fastcgi_param SCRIPT_FILENAME rootfastcgi_script_name;
                        fastcgi_param  PATH_INFO $request_uri;
                        include fastcgi_params;
           }
   }