$array = [
  'category1' => 'first category',
  'category2' => 'second category',
];
 
$new = array_map(function($key, $value) {
  return "{$key} => {$value}";
}, array_keys($array), $array);

这可能是最简单的推理:

$states = array('az' => 'Arizona', 'al' => 'Alabama');

array_map(function ($short, $long) {
    return array(
        'short' => $short,
        'long'  => $long
    );
}, array_keys($states), $states);

// produces:
array(
     array('short' => 'az', 'long' => 'Arizona'), 
     array('short' => 'al', 'long' => 'Alabama')
)

你可以使用map方法从这个数组库中轻松地实现你想要的:

Arr::map($test_array, function($a, $b) { return "$a loves $b"; });

此外，它保留键并返回新的数组，更不用说几个不同的模式来满足您的需求。

我会这样做:

<?php

/**
 * array_map_kv()
 *   An array mapping function to map with both keys and values.
 *
 * @param $callback callable
 *   A callback function($key, $value) for mapping values.
 * @param $array array
 *   An array for mapping.
 */
function array_map_kv(callable $callback, array $array) {
  return array_map(
    function ($key) use ($callback, $array) {
      return $callback($key, $array[$key]); // $callback($key, $value)
    },
    array_keys($array)
  );
}

// use it
var_dump(array_map_kv(function ($key, $value) {
  return "{$key} loves {$value}";
}, array(
  "first_key" => "first_value",
  "second_key" => "second_value",
)));

?>

结果:

array(2) {
  [0]=>
  string(27) "first_key loves first_value"
  [1]=>
  string(29) "second_key loves second_value"
}

如果你只需要它一次，闭包就可以了。我会用发电机。

$test_array = [
    "first_key" => "first_value", 
    "second_key" => "second_value",
];

$x_result = (function(array $arr) {
    foreach ($arr as $key => $value) {
        yield "$key loves $value";
    }
})($test_array);

var_dump(iterator_to_array($x_result));

// array(2) {
//   [0]=>
//   string(27) "first_key loves first_value"
//   [1]=>
//   string(29) "second_key loves second_value"
// }

对于可重复使用的东西:

function xmap(callable $cb, array $arr)
{
    foreach ($arr as $key => $value) {
        yield $cb($key, $value);
    }
}

var_dump(iterator_to_array(
    xmap(function($a, $b) { return "$a loves $b"; }, $test_array)
));

我发现它忽略了最明显的答案:

function array_map_assoc(){
    if(func_num_args() < 2) throw new \BadFuncionCallException('Missing parameters');

    $args = func_get_args();
    $callback = $args[0];

    if(!is_callable($callback)) throw new \InvalidArgumentException('First parameter musst be callable');

    $arrays = array_slice($args, 1);

    array_walk($arrays, function(&$a){
        $a = (array)$a;
        reset($a);
    });

    $results = array();
    $max_length = max(array_map('count', $arrays));

    $arrays = array_map(function($pole) use ($max_length){
        return array_pad($pole, $max_length, null);
    }, $arrays);

    for($i=0; $i < $max_length; $i++){
        $elements = array();
        foreach($arrays as &$v){
            $elements[] = each($v);
        }
        unset($v);

        $out = call_user_func_array($callback, $elements);

        if($out === null) continue;

        $val = isset($out[1]) ? $out[1] : null;

        if(isset($out[0])){
            $results[$out[0]] = $val;
        }else{
            $results[] = $val;
        }
    }

    return $results;
}

工作方式完全类似于array_map。几乎。

实际上，它不是纯粹的地图，就像你从其他语言中知道的那样。Php非常奇怪，所以它需要一些非常奇怪的用户函数，因为我们不想恢复我们精确地破坏越坏越好的方法。

实际上，它根本不是地图。然而，它仍然非常有用。

First obvious difference from array_map, is that the callback takes outputs of each() from every input array instead of value alone. You can still iterate through more arrays at once. Second difference is the way the key is handled after it's returned from callback; the return value from callback function should be array('new_key', 'new_value'). Keys can and will be changed, same keys can even cause previous value being overwritten, if same key was returned. This is not common map behavior, yet it allows you to rewrite keys. Third weird thing is, if you omit key in return value (either by array(1 => 'value') or array(null, 'value')), new key is going to be assigned, as if $array[] = $value was used. That isn't map's common behavior either, yet it comes handy sometimes, I guess. Fourth weird thing is, if callback function doesn't return a value, or returns null, the whole set of current keys and values is omitted from the output, it's simply skipped. This feature is totally unmappy, yet it would make this function excellent stunt double for array_filter_assoc, if there was such function. If you omit second element (1 => ...) (the value part) in callback's return, null is used instead of real value. Any other elements except those with keys 0 and 1 in callback's return are ignored. And finally, if lambda returns any value except of null or array, it's treated as if both key and value were omitted, so: new key for element is assigned null is used as it's value

警告: 请记住，最后一个功能只是前面功能的残留，它可能完全无用。非常不鼓励依赖这个特性，因为在未来的版本中，这个特性将被随机弃用并意外地更改。

注意: 与array_map不同，传递给array_map_assoc的所有非数组参数(第一个回调参数除外)都被无声地强制转换为数组。

例子: // TODO:例子，有人知道吗?