There are always way to achieve this or that. Your issue is an application issue, so search for a migration tutorial for your specific application.
This is not an issue XAMPP can solve for you.
And again (last warning): If you use XAMPP in a public accessable environment, your application and data is not safe. There are ways to hijack public accessable xampp installations, which can result in data loss, integrating your server to a botnet to act as spam or DOS bot, etc.
There are other ways for unexperienced users to host a php application online like renting webspace.
We don't provide any support via personal channels like PM, email, Skype, TeamViewer!It's like porn for programmers