递归合并数组PHP答案

【问题标题】：Merging arrays recursively PHP递归合并数组PHP
【发布时间】：2017-07-19 04:17:12
【问题描述】：

我正在使用这个函数递归合并两个数组：

function array_merge_recursive_distinct(array &$array1, array &$array2) {

  $merged = $array1;

  foreach($array2 as $key => &$value) {

      if(is_array($value) && isset($merged[$key]) && is_array($merged[$key])) {

          $merged[$key] = array_merge_recursive_distinct($merged[$key], $value);

      } else {

          $merged[$key] = $value;
      }
  }

  return $merged;
}

为了使用此功能，我正在执行以下步骤：

声明一个空数组 $outArray = array();
做一个while循环来收集我需要的信息
- 在 while 循环期间，我调用 array_merge_recursive_distinct 函数以递归方式填充空数组

然而，最终的数组只包含它在最后一个 while 循环中收集到的最后信息。我试图找到一个解决方案，但直到现在我还没有成功。我究竟做错了什么？递归函数在 while 循环期间获取所有信息（我已经在递归函数中打印了输入数组），但它似乎一遍又一遍地覆盖合并的数组。

谢谢

【问题讨论】：

标签： php arrays recursion merge

【解决方案1】：

CakePHP 有一个名为 Hash 的好类，它实现了一个名为 merge() 的方法，它可以满足您的需要

/**
 * This function can be thought of as a hybrid between PHP's `array_merge` and `array_merge_recursive`.
 *
 * The difference between this method and the built-in ones, is that if an array key contains another array, then
 * Hash::merge() will behave in a recursive fashion (unlike `array_merge`). But it will not act recursively for
 * keys that contain scalar values (unlike `array_merge_recursive`).
 *
 * Note: This function will work with an unlimited amount of arguments and typecasts non-array parameters into arrays.
 *
 * @param array $data Array to be merged
 * @param mixed $merge Array to merge with. The argument and all trailing arguments will be array cast when merged
 * @return array Merged array
 * @link http://book.cakephp.org/2.0/en/core-utility-libraries/hash.html#Hash::merge
 */
function merge_arrays_recursivelly(array $data, $merge) { // I changed the function name from merge to  merge_arrays_recursivelly
    $args = array_slice(func_get_args(), 1);
    $return = $data;

    foreach ($args as &$curArg) {
        $stack[] = array((array) $curArg, &$return);
    }
    unset($curArg);

    while (!empty($stack)) {
        foreach ($stack as $curKey => &$curMerge) {
            foreach ($curMerge[0] as $key => &$val) {
                if (!empty($curMerge[1][$key]) && (array) $curMerge[1][$key] === $curMerge[1][$key] && (array) $val === $val) {
                    $stack[] = array(&$val, &$curMerge[1][$key]);
                } elseif ((int) $key === $key && isset($curMerge[1][$key])) {
                    $curMerge[1][] = $val;
                } else {
                    $curMerge[1][$key] = $val;
                }
            }
            unset($stack[$curKey]);
        }
        unset($curMerge);
    }
    return $return;
}

https://book.cakephp.org/2.0/en/core-utility-libraries/hash.html#Hash::merge

Hash::merge source code

【讨论】：

【解决方案2】：

也许这样的东西可能会很方便。

function array_merge_recursive_distinct(array &$array1, array &$array2) {
    $merged = array_merge($array1,$array2);
    asort($merged);
    $merged = array_values(array_unique($merged));
    return $merged;
}
$array1 = [];
$array2 = [1,2,3,4,5];
print_r(array_merge_recursive_distinct($array1,$array2));
$array1 = [1,2,3,6,12,19];
$array2 = [1,2,3,4,5];
print_r(array_merge_recursive_distinct($array1,$array2));
// output
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 12
    [7] => 19
)

在PHP Sandbox上测试它

【讨论】：