PHP Data Object (PDO) is a database abstraction layer that unifies access to different databases in your website or application. The library provides you with a low-level programming interface that makes your code clean and highly maintainable. With the PDO library, you can seamlessly switch between different databases (for example, MySQL to SQLite) by tweaking your connection string. This makes you more productive because you don't have to re-write your SQL statements every time you migrate to ......