Iterable objects and array type hinting?

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I think you mean instanceof Iterator, PHP doesn’t have an Iterable interface. It does have a Traversable interface though. Iterator and IteratorAggregate both extend Traversable (and AFAIK they are the only ones to do so).

But no, objects implementing Traversable won’t pass the is_array() check, nor there is a built-in is_iterable() function. A check you could use is 

function is_iterable($var) {
    return (is_array($var) || $var instanceof Traversable);
}

To be clear, all php objects can be iterated with foreach, but only some of them implement Traversable. The presented is_iterable function will therefore not detect all things that foreach can handle.

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