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@ 2013-06-20T11:36:37Z

<?php
$array = [0 => 'a'];                                                   
 
$it = new RecursiveIteratorIterator(
    new RecursiveArrayIterator($array));
var_dump($it->key());

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

37.61 ms | 402 KiB | 5 Q