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@ 2014-05-30T20:22:43Z

<?php
$a = new ArrayObject(array(), 1);
$a['null'] = null;
var_dump($a->offsetExists('null'));
var_dump(isset($a['null']));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

86.69 ms | 402 KiB | 5 Q