What is the most elegant way to change a key of an array by preserve the order

Question

I have a big associative array with over 1 000 items and I want to rename one key but the order must be preserved.

I don't wont to iterate over the complete array and copy it into a new.

Answer 1

have a look at the array_splice function: http://php.net/manual/en/function.array-splice.php

this will do the job

Answer 2

$arr[$newkey] = $arr[$oldkey];
unset($arr[$oldkey]);

Answer 3

  $array_keys = array_keys($array);

  $array_keys[array_search('old', $array_keys)] = 'new';

  $array = array_combine($array_keys, $array);

Answer 4

$array[$newkeyname] = $array[$oldkeyname];
unset($array[$oldkeyname]);