Can you override interface methods with different, but “compatible”, signatures?

Question

Consider the following PHP interfaces:

interface Item {
    // some methods here
}

interface SuperItem extends Item {
    // some extra methods here, not define         


        

Answer 1

As a workaround I'm using PHPDoc blocks in interfaces.

interface Collection {
   /**
    * @param Item $item
    */
    public function add($item);
    // more methods here
}

interface SuperCollection extends Collection {
    /**
    * @param SuperItem $item
    */
    public function add($item);
    // more methods here that "override" the Collection methods like "add()" does
}

This way, in case you are properly using interfaces, IDE should help you catch some errors. You can use similar technique to override return value types as well.