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@ 2014-09-30T06:21:23Z

<?php

$arr    = array('a' => 'a', 'b' => 'b', 'c' => 'c');
$oldKey = 'b';
$newKey = 'new';
array_splice($arr, 1, 1, array($newKey => $arr[$oldKey]));
var_dump($arr);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_splice: documentation ( source)

preferences:dark modelive preview

41.32 ms | 402 KiB | 5 Q