Where should put all the php project in Xampp server?

I'm very new to XAMPP and now trying to send SQLite data from android to MySQL. I've been reading many tutorials and this is one of the tutorial I read.

The article using Wamp server and located all the file.php in C:/wamp/www. I using XAMPP server and can't find the www folder. Which folder should I put all the .php file ? Thanks