Mobile Library application

[gupta]

Hello, I'm new to php and my sql and need your help. I've to design Library application where i can store basic information of library books with category of those books and user info. The user can log in and browse this  application from mobile. I've designed the database and now let me know how can i proceed with php implementation the user should be able to see the books based on category, with (+) icon , ie when user presses (+) icon then those books which belongs to this category should be displayed.

 

Let me know how to achieve the same in php ?

Which drivers to use to connect between my sql and php ?

How to send http request and receive response from mobile to database ?

 

I'm sure to get mature answer from this forum.

 

Many Thanks