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@ 2016-03-22T08:19:22Z

<?php

class x extends ArrayObject {
    public function __construct() {
        $this['x']['y'] = 'valami';
    }
}

$x = new x();

var_dump(isset($x['x']['y']));

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

27.69 ms | 402 KiB | 5 Q