Specifying MySQL Port and Socket

Although extremely unlikely, it's possible you might run into a web server where you can't connect to the database with just the host name, username, password and database name. This may be because it requires a special socket. Open config.php and change

$adb = new db($dbhost, $dbuser, $dbpass, $databasename);

$adb = new db($dbhost, $dbuser, $dbpass, $databasename, 3306, '/tmp/mysql5.sock');

where 3306 is your port name and /tmp/mysql5.sock is the socket (these values are specific to your host). This will fix the problem, if you use the correct port number and socket name.