as far as I know, PHP my admin have setting user can remote access or not.
Like
this and
this
you have to search this file and do some modification
/etc/httpd/conf.d/phpMyAdmin.conf
If you install php xampp on port 80, in example, you can access phpmyadmin on port 80 from another computer using ip or computer name and port.
in example :
yourComputerName:80/phpmyadmin
or in example your ip is 192.177.222.10
so, your phpMyAdmin should :
192.177.222.10:80/phpMyAdmin
At your xampp there is setting are server can use remotely or not something like
this
You should search this file:
httpd-xampp.conf