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@ 2014-05-30T19:55:26Z

<?php

        $a = new ArrayObject();
        $a->offsetSet('null', null);
        var_dump($a->offsetExists('null'));
        var_dump(array_key_exists('null', $a));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

39.97 ms | 402 KiB | 5 Q