Mongo $exists problem

gistfile1.php

$q = array("myKey" => array('$exists'=>true));
$cursor = $mongo->db->coll->find($q);

echo $cursor->count(); // this returns the number 51

while($cursor->hasNext()){

	$v = $cursor->getNext();
	
	print_r($v); // this returns nothing

}

solved it - if you do

$q = array("myKey.Subkey" => array('$exists'=>true));

then it works. i guess it's a weird bug on php driver.