How to check if variable is array?… or something array-like

Question

I want to use a foreach loop with a variable, but this variable can be many different types, NULL for example.

So before foreach

Answer 1

You can check instance of Traversable with a simple function. This would work for all this of Iterator because Iterator extends Traversable

function canLoop($mixed) {
    return is_array($mixed) || $mixed instanceof Traversable ? true : false;
}