PHP PDO Connection Factory: Create PDO objects to connect to a database

This class can create PDO objects to connect to a database.

It can take an array of parameters to establish a connection with a database using PDO.

The parameters can define values like the database driver name, database host, user, password and database name.

The class may also change individual connection parameters after the class object is created.

In the end it returns an object of the PDO class ready to be used by the application.