如何在维护订单的同时更改数组中的键？

Question

我怎么能这样做:

$array = array('a' => 1, 'd' => 2, 'c' => 3); //associative array

// rename $array['d'] as $array['b']
$array = replace_key_function($array, 'd', 'b');

var_export($array); // array('a' => 1, 'b' => 2, 'c' => 3); same order!

我没有看到这样做的功能.有办法做到这一点？

Answer 1

http://ideone.com/nCZnY

$array = array('a' => 1, 'd' => 2, 'c' => 3); //associative array

// rename $array['d'] as $array['b']
$array = replace_key_function($array, 'd', 'b');

var_export($array); // array('a' => 1, 'b' => 2, 'c' => 3); same order!

function replace_key_function($array, $key1, $key2)
{
    $keys = array_keys($array);
    $index = array_search($key1, $keys);

    if ($index !== false) {
        $keys[$index] = $key2;
        $array = array_combine($keys, $array);
    }

    return $array;
}