Err, as you say, PHP should make things easy. I don't see how
making tell NULL from an undefined variable makes anything 

At 15:49 3.5. 2001, Andi Gutmans wrote the following:
>At 08:48 AM 5/3/2001 -0500, Andrei Zmievski wrote:
>>On Thu, 03 May 2001, Andi Gutmans wrote:
>>> >key_exists(), you mean? I didn't put it in, and as far as I know it's
>>> >still there.
>>> I'd really like to nuke it.
>>I can sort of see his point really, if $array['foo'] = NULL there is no
>>way to know whether key 'foo' exists or not..
>Yeah but I'm afraid it'll make scripts be written on behavior which shouldn't be 
>counted on.
>Maybe in future versions of Zend $array['foo'] won't be defined. There are certain 
>situations where I think it was impossible to not define it so it was defined with 
>NULL meaning it's not defined.
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