"S.A.N" in php.internals (Mon, 25 May 2015 16:09:42 +0300):
>> It is by design; the documentation states[1]:
>>
>> | isset() only works with variables as passing anything else will
>> | result in a parse error.
>>
>> [1]
>> <http://php.net/manual/en/function.isset.php#refsect1-function.isset-notes>
>
>Ok, the way it works in PHP 7.

There was some discussion on contant arrays on Stackoverflow with an
answer by Andrea Faulds (with a link to changes between 5.6 and 7.0):
http://stackoverflow.com/a/27413238/872051

Jan

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