php - Php Array_filter 从数组数组中取消设置键值

Question

我想从我的嵌套数组数组中取消设置数组元素。

我想执行递归数组过滤器，但我不确定如何有效地做到这一点。

下面是原始数组。

[
  [a] => 3
  [b] => 0
  [c] => [
    [
      [1] => aa
      [2] => 1
      [3] => [
                [
                  [a1] => 6
                  [a2] => 5781
                  [a3] =>
                      [
                        [1] => 0
                        [2] => 19550
                        [3] => 5781
                      ]
                ]
                [
                  [a1] => 1
                  [a2] => 5781
                  [a3] =>[
                          [1] => 0
                          [2] => 19550
                          [3] => 5781
                      ]
                ]
              ]
    ]
    [
      [1] => aa
      [2] => 1
      [3] => [
                [
                  [a1] => 6
                  [a2] => 5781
                  [a3] =>
                      [
                        [1] => 0
                        [2] => 19550
                        [3] => 5781
                      ]
                ]
                [
                  [a1] => 1
                  [a2] => 5781
                  [a3] =>[
                          [1] => 0
                          [2] => 19550
                          [3] => 5781
                      ]
                ]
              ]
    ]
  ]
]

预期数组

[
  [a] => 3
  [c] => [
    [
      [1] => aa
      [3] => [
                [
                  [a1] => 6
                  [a3] =>
                      [
                        [2] => 19550
                        [3] => 5781
                      ]
                ]
                [
                  [a1] => 1
                  [a3] =>[
                          [2] => 19550
                          [3] => 5781
                      ]
                ]
              ]
    ]
    [
      [1] => aa
      [3] => [
                [
                  [a1] => 6
                  [a3] =>
                      [
                        [2] => 19550
                        [3] => 5781
                      ]
                ]
                [
                  [a1] => 1
                  [a3] =>[
                          [2] => 19550
                          [3] => 5781
                      ]
                ]
              ]
    ]
  ]
]

正如您在每个嵌套数组中的预期数组中看到的那样，一些键值对已被删除。我需要根据键名过滤数组。那是我的键名是固定的，需要从里面的每个子数组中删除。

任何帮助将不胜感激。

标签： phplaravel-5

Answer 1

这是一个基于递归 foreach 的解决方案的示例，用于处理您提供的数据集的代码。

    $sourceArray = array("a" => 3, "b" => 0, "c" => array("1" => "aa", "2" => 1, "3" => array("a1" => 6, "a2" => 5781, "a3" => array("1" => 0, "2" => 19550, "3" => 5781)), array( "a1" => 1, "a2" => 5781, "a3" =>array("1" => 0, "2" => 19550, "3" => 5781 ))), array( "1" => "aa", "2" => 1, "3" => array( array( "a1" => 6, "a2" => 5781, "a3" => array( "1" => 0, "2" => 19550,"3" => 5781))), array( "a1" => 1, "a2" => 5781, "a3" =>array(  "1" => 0, "2" => 19550, "3" => 5781))));

    print_r($sourceArray,1);

    function removeKeys($keys, $sourceData) {

        foreach ($sourceData as $key=>$val) {

            if (in_array($key, $keys, true)) {
                unset($sourceData[$key]);
            } else if (is_array($val)) {
                $sourceData[$key] = removeKeys($keys, $sourceData[$key]);
            }
        }
        return $sourceData;
    }

    $keysToRemove = array("b","2","a2");

    $newArray = removeKeys($keysToRemove, $sourceArray);

    print_r($newArray);

尽管获取数据有点挑战，但实现起来很简单。我确实注意到此示例中的一个“错误”，即如果原始数组中的键为“0”，即使它不在 $keys 数组中，它仍会被删除。

但我假设这个例子足以回答你的问题，并且我所说的边缘情况不会发生（即，“0”不是数组中的键值。）如果你确实使用“0”作为键，你可以添加额外的逻辑来捕获这种情况，但它会稍微减慢函数的速度，所以我将把这个选择留给你。

（请注意，上面提到的错误现在已在代码中修复......请参阅下面的注释以获取原始海报的解决方案）