This could be viewed as a philosophy. I wonder why a NULL
variabel is being considered FALSE rather than TRUE while in
isset, because if the variable has been unset it becomes
undefined but a NULL variabel is still defined although it
has no value. Or, perhaps, it's based on the memory usage,
if it is how about $x="" ? Is empty value use
memory too? This leads me to another thinking that the isset
isn't have family relationship with unset although both of
it are a language construct and have 'set' word 
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