Problem with my PHP test page

Hi, all! I apologize for the dumb question.

I am wanting to learn the basics of PHP, and I don't have the kind of connection to download anything like WAMP, XAMPP or EasyPHP to experiment with locally...so my question is...

Is there any way that I can create a test page or play page just for PHP that doesn't interfere with my main site? For instance...just a page that I can edit and view the output of simple commands like: (for whatever reason the code isn't showing up properly here)

echo "Hello";
?>

Can someone please tell me if this is possible and how I might do that? Blessings!

You have to download XAMPP