I'm trying to pull a random instance of a class (object) by generating a random number and checking object ids against that number.

I've found a lot of info on how to retrieve an object attribute (specifically here it's the id) but not without knowing which object first.

So within my class I've got 

```
public function getID() {
return $this->id;
}

```

But 

```
getID()

```

only works if I use it as 

```
$object->getID()

```

Is there a way to do something similar but for every object in a class, without specifying the objects?

I'm trying to avoid having to write if/then for every object in the class.