php - is_null vs ===null

Question

Possible Duplicate:
What's the difference between is_null($var) and ($var === null)?

Is there any difference between following code:

if(is_null($x)) { ...

and

if($x===null) { ...

Answer 1

Yes. == is a loose comparison, meaning a lot more than just NULL will result in true in the second version. See the type comparison tables.