title: how to check if an array has value that === null without looping?
body: <p><a href="http://php.net/manual/en/function.in-array.php" rel="noreferrer">http://php.net/manual/en/function.in-array.php</a> - has issues with that since it checks only by <code>==</code>. Is there any clever oneliner here that can do it by <code>===</code> ?</p>
  
  <p>That is to return false if an array is empty, that is has 0 elements, or when array doesn't contain any value that is exactly null. True if array has at least one <code>=== null</code> element.</p>