PDO or PHP Data Objects is a very powerful yet lightweight API for for accessing database in MySql. If you are using PHP 5.1.0 or above it comes pre-installed. So if you are one of the guys still using the old mysql_query and related functions, this is the right time to upgrade. Using this mini project you can learn how to create a simple address book with php and mysql using pdo. This mini project will help get you get started with things you need to know to start coding with pdo.