Invalid argument supplied for foreach() in PHP Language ?

foreach ((array) $items as $item) {

 // ...

 }   

  Determine if a variable is iterable. i.e. can be used to loop over.

 *

 * @return bool

 /

function is_iterable($var)

{

    return $var !== null 

        && (is_array($var) 

            || $var instanceof Traversable 

            || $var instanceof Iterator 

            || $var instanceof IteratorAggregate

            );

}



$values = get_values();



if (is_iterable($values))

{

    foreach ($values as $value)

    {

        // do stuff...

    }

} 

if (is_array($values) || is_object($values))

{

    foreach ($values as $value)

    {

        ...

    }

}