- reset: documentation ( source)
- print_r: documentation ( source)
- array_flip: documentation ( source)
<?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 $reset[0]['k1'];
print_r(array_flip($reset[0]));