Leaderboard

Problem is, you're talking about very different ways of getting the data. In the grand scheme of things the problem is as easy as ginerjm says - you get the data and output it while building the response. However, if you're using a CSV you'll need to research fopen() and fgetcsv(). If you're using a JSON string it'll be fopen() and decode_json(). If it's a database, research PDO and MySQL. And if it's an Excel file, that's a whole other can of worms that's going to entail third-party libraries. Each potential path has it's own ups and downs; you'll need to decide how you want to store and retrieve the data. Outputting said data is easy - in every case it's a simple echo statement.

The following w3school page talks about collapsing a website navigation for smaller/mobile screens: https://www.w3schools.com/howto/howto_js_mobile_navbar.asp