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@ 2014-09-26T08:48:25Z

<?php
$array = array("person1" => array(0 => array('k1'=>'v1', 'k2'=>'v2'), 1 => array('k1'=>'v1', 'k2'=>'v2')), "person2" => array(0 => array('k1'=>'v1', 'k2'=>'v2'), 1 => array('k1'=>'v1', 'k2'=>'v2')));
$reset_key = reset($array);
$first_key = key($array);
echo $reset_key;

Output
Performance
VLD
References
Branches

reset: documentation ( source)
key: documentation ( source)

preferences:dark modelive preview

54.65 ms | 402 KiB | 5 Q