Description:
------------
StdClass does not implement the Traversable interface but can be iterated over in  
a foreach loop.  

Test script:
---------------
$stdClass = new StdClass;
$stdClass->setUp = function () {
    echo "event[setUp] . . . \n";
};
$stdClass->tearDown = function () {
    echo "event[tearDown] . . . \n";
};

echo "StdClass instanceof Traversable: ";
echo $stdClass instanceof Traversable
    ? "Traversable\n"
    : "Not traversable\n";

foreach ($stdClass as $key => $value) {
    echo "$key => ";
    $value();
}


Expected result:
----------------
StdClass instanceof Traversable: Traversable
setUp => event[setUp] . . . 
tearDown => event[tearDown] . . .

Actual result:
--------------
StdClass instanceof Traversable: Not traversable
setUp => event[setUp] . . . 
tearDown => event[tearDown] . . .