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@ 2013-12-31T09:06:54Z

<?php
class A{
    public $null = null;
}

$a = new A;
var_dump(isset($a->null));
var_dump(array_key_exists((string) null, $a));

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

45.47 ms | 402 KiB | 5 Q