<?
$array = array('A', 'B', 'C', 'D', 'E', 'F', 'G');
$arrayForWalking = $data;
$newArray = array();
array_walk($arrayForWalking, function ($v, $k) use (&$array, &$newArray) {
$newArray[$k] = $v;
unset($array[$k]);
});
var_dump($array, $newArray);