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run code in 200+ php & hhvm versions
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<?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[0];
based on 8022v
Output for 5.4.0 - 7.2.0
Notice: Array to string conversion in /in/QUDou on line 5 Array
Output for 4.3.0 - 5.3.29
Array