保留键的同时反转数组值 [英] Reverse array values while keeping keys

问题描述

这是我拥有的一个数组:

Here is an array I have:

$a = array('a' => 'a1', 'b' => 'a2', 'c' => 'a3', 'd' => 'a4', 'e' => 'a5');

我想做的是在保持键完整的同时反转数组的值，换句话说，它应该是这样的:

What I would like to do is reverse the values of the array while keeping the keys intact, in other words it should look like this:

$a = array('a' => 'a5', 'b' => 'a4', 'c' => 'a3', 'd' => 'a2', 'e' => 'a1');

我应该怎么做?

附言我尝试使用 array_reverse() 但它似乎不起作用

P.S. I tried using array_reverse() but it didn't seem to work

推荐答案

一些使用原生 PHP 函数的逐步处理(这可以用较少的变量进行压缩):

Some step-by-step processing using native PHP functions (this can be compressed with less variables):

$a = array('a' => 'a1', 'b' => 'a2', 'c' => 'a3', 'd' => 'a4', 'e' => 'a5');

$k = array_keys($a);
$v = array_values($a);

$rv = array_reverse($v);

$b = array_combine($k, $rv);

var_dump($b);

结果:

array(5) {
  'a' =>
  string(2) "a5"
  'b' =>
  string(2) "a4"
  'c' =>
  string(2) "a3"
  'd' =>
  string(2) "a2"
  'e' =>
  string(2) "a1"
}

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