How do I convert a php web application into a desktop application and retain database

We have a web-application developed in PHP. But most of clients don't have internet connection all the time. So, is there way to convert the app into a desktop application so that it works stand alone and it syncs to web application whenever there is an internet connection? Currently I am testing it locally via xampp and it works but I dont want to have to install xampp or wamp on a clients pc. I am an amateur at coding FYI. I would appreciate any precise answer with example.