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run code in 150+ 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'))); $reset = reset($array); echo $reset[0]['k1']; echo array_flip($reset[0]);
based on 3821q
Output for 5.4.0 - 7.1.0
v1 Notice: Array to string conversion in /in/9PRgm on line 5 Array
Output for 4.3.0 - 5.3.29
v1Array