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Subject: [PHP-DEV] Fatal error: isset(CONST_ARRAY['key']) PHP 5.6
From: ua.san.alex@gmail.com ("S.A.N")

<?php

const CONST_ARRAY =
[
    'key' => 'value'
];

isset(CONST_ARRAY['key']); // Fatal error: Cannot use isset() on the
result of an expression (you can use "null !== expression" instead)

?>

It is design, or a bug?