Instanceof rant

instanceof.php

<?php

final class Foo {
    public function bar (AnemicObject $object) {
        switch (true) {
            case $object instanceof Alfa:
                // do alpha shizzle
             case $object instanceof Beta:
                // do beta shizzle  
        }
    }
}

// refactor to:

final class Foo {
    public function bar (PolymorphicThing $object) {
        $object->doShizzle();
    }
}

interface PolymorphicThing {
    public function doShizzle();
}
final class Alfa implements PolymorphicThing {
    public function doShizzle() {
        // move alpha shizzle here
    }
}
final class Beta implements PolymorphicThing {
    public function doShizzle() {
        // move beta shizzle here
    }
}