This is a very old PHP class that I created circa 2006 to act as a wrapper for PHP's MySQL functions. It has a number of nice functions that accept parameters via arrays and builds queries with them. It's used statically, not actually instantiated. For instance:
// Connect to database
DB::connect('localhost', 'db', 'root', 'pass');
// Get an array of all employees with the first name 'fred' in descending order by their start date
$employees = DB::selectArray('employees', '*', array('first_name' => 'fred'), 'date_start', true);
// Disconnect from database
DB::disconnect();
This makes the wrapper fast and easily accessible in functions, but also quite limited. For instance, it's not meant for situations in which you will need to connect to multiple databases concurrently.
This class uses PHP's (very dated) mysql_* functions which have been depreciated as of PHP 5.5. My intent is to update this class to one of PHP's newer MySQL libraries.
As of version 2.0 (August 18th 2013), this class now uses PHP's MySQLi extension.
There are certainly more robust database solutions out there, but for simple projects and scripts, this class may prove useful.