This is a tutorial which teaches the users how to make their own database API that is used with different database types using php. The author explains the users about using class which provides functions to send a query to database and to fetch the number of rows in a result set. This tutorial provides an example for the class which uses php postgreSQL API to the users who can use it in their codings. This tutorial provides info that the class handles details like connecting to a database, to keep track of connection and result id to code.