Weak Closures

Hi Internals, I'd like to express my interest in a possible feature concerning weak references. Currently closures created within a class appear to contain a reference to the object that created it. This is of course necessary in order for the closure to retain the necessary scope. However I would like to suggest we have the option for closure to weakly reference this object so that when the object is garbage collected, the closure too may be rendered null or invalid (inspectable). Consider the following example: https://gist.github.com/orolyn/7651e4127759aad1736547490baa1394 The idea here is that without unset($sample) the loop would run forever, because there is a reference to the callback from the object, and in turn there is a reference to the object from the main stack. With the unset($sample), the idea is that before the callback is even called, the reference to the object is destroyed thusly so is the reference to callback, and since the callback is only referenced now in a WeakMap, the callback will finally be gone. In reality it appears there is a circular reference between the object and the callback. I don't know if this is a bug or not, because from what I can find PHP was fixed a long time ago to resolve circular references. However if this is intentional, I would like the option to make the closure weak for example: $c = WeakClosure::fromCallable(function () {}); $c = Closure::fromCallable(function () {}, true); Please let me know your thoughts, because maybe there is a way of achieving this with PHP as is. Kind regards, Dominic