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) { ...
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1 回答
2
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.
于 2012-04-29T06:18:25.457 回答