PHP Traversable type hint

Question

I have a relatively simple function which uses a foreach

function foo($t) {
     $result;
     foreach($t as $val) {
         $result = dosometh         


        

Answer 1

Same problem. I've given up I simply manually code everything in the function.

This should give you the functionality you want:

function MyFunction($traversable)
{
    if(!$traversable instanceof Traversable && !is_array($traversable))
    {
        throw new InvalidArgumentException(sprintf(
            'Myfunction($traversable = %s): Invalid argument $traversable.'
            ,var_export($traversable, true)
       ));
    }
}

EDIT

If you only want to display type of $traversable. And if you want the functionality inheritable in child classes.

public function MyMethod($traversable)
{
    if(!$traversable instanceof Traversable && !is_array($traversable))
    {
        throw new InvalidArgumentException(sprintf(
            '%s::MyMethod($traversable): Invalid argument $traversable of type `%s`.'
            ,get_class($this)
            ,gettype($traversable)
       ));
    }
}