Switch inside a for loop?

[|2eM!x]

Okay, i want to do something on every iteration of my loop(except every 4th), and i want to do something else on every 4th loop.

        for ($i = 0; $i < strlen($stuff);$i++){
            switch(bcmod($i,4)){
                case '0':
                    echo 'stuff here';
                    return;
                default:
                    echo ord(substr($stuff,$i,1)).'.';
                    return;
            }
            } 

But instead, it will echo 'stuff here' and thats all.. any ideas?