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@ 2014-05-30T20:16:03Z

<?php
class B extends ArrayObject { }
$a = new B();
$a['null'] = null;
var_dump($a->offsetExists('null'));
var_dump(isset($a['null']));
var_dump(array_key_exists('null', $a));

Output
Performance
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References
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var_dump: documentation ( source)

preferences:dark modelive preview

35.43 ms | 402 KiB | 5 Q