Yes you can, aslong as the implemented class contains at least all of the methods etc in the interface you can have extra methods in the implemented class.

An important note that i forgot is that the interface class is a totally abstracted class, in other words it doesnt do anything, there are no workings or body to it, it has methods etc but no guts to it, its up to the implemented classes to take care of that.

glad you liked it :)

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mysql> SELECT * FROM `users` WHERE `users`.`clue` > 0;
Empty set (0.00 sec)