Answer 1

When it comes to Android, I personally like to code in both PHP and MySQL. The majority of web servers available on the market are pretty expensive considering on what do people do on their mobile phones. Here is a free one: "Palapa Web Server". It's a free, powerful tool to emulate an Apache web server on Android and you can code both in PHP and SQL. Installing PhpMyAdmin may not work on some phones and you may get it manually.