php怎么更改数组的键值

array_combine(array $keys , array $values ) : array

$fruits = array("apple" => "red", "banana" => "yellow", "orange" => "orange");$newKeys = array("a", "b", "c");$newFruits = array_combine($newKeys, $fruits);print_r($newFruits);

Array(    [a] => red    [b] => yellow    [c] => orange)

array_walk(array &$array , callable $callback [, mixed $userdata = NULL ] ) : bool

$fruits = array("apple" => "red", "banana" => "yellow", "orange" => "orange");function changeKey(&$value, $key, $prefix) {    $value = $prefix . $key;}array_walk($fruits, 'changeKey', 'fruit_');print_r($fruits);

Array(    [fruit_apple] => red    [fruit_banana] => yellow    [fruit_orange] => orange)

array_map(callable $callback , array $array1 [, array $array2, ... ] ) : array

$fruits = array("apple" => "red", "banana" => "yellow", "orange" => "orange");$keysSuffix = array("1", "2", "3");$newKeys = array_map(function($key, $suffix) {    return $key . $suffix;}, array_keys($fruits), $keysSuffix);$newFruits = array_combine($newKeys, $fruits);print_r($newFruits);

Array(    [apple1] => red    [banana2] => yellow    [orange3] => orange)