RTFM :))

http://www.php.net/manual/en/html/function.is-null.html

At 16:47 3.5. 2001, Andi Gutmans wrote the following:
-------------------------------------------------------------- 
>At 10:43 AM 5/3/2001 -0400, Joe Brown wrote:
>>What about an isnull() function, opposed to key_exists();
>>
>>IsPossible()?
>
>Yeah that's definitely a possiblity but then you'd have to do something like.
>if (isset($a["foo"]) || isnull($a["foo"))
>
>Kind of sucky.
>But we should think of a good resolution for a major version.
>
>Andi
>
>
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