如何在 PHP 数组中递归运行 array_filter? [英] How to run array_filter recursively in a PHP array?

问题描述

给定以下数组 $mm

Array
(
    [147] => Array
        (
            [pts_m] => 
            [pts_mreg] => 1
            [pts_cg] => 1
        )    
    [158] => Array
        (
            [pts_m] => 
            [pts_mreg] => 
            [pts_cg] => 0
        )

    [159] => Array
        (
            [pts_m] => 
            [pts_mreg] => 1
            [pts_cg] => 1
        )

)

当我运行 count(array_filter($mm)) 我得到 3 作为结果，因为它不是递归的.

When I run count(array_filter($mm)) I get 3 as result since it is not recursive.

count(array_filter($mm), COUNT_RECURSIVE) 也不行，因为我实际上需要递归运行 array_filter，然后计算其结果.

count(array_filter($mm), COUNT_RECURSIVE) also will not do because I actually need to run the array_filter recursively, and then count its result.

所以我的问题是:在这种情况下如何递归运行 array_filter($mm) ?我在这里的预期结果是 4.

So my question is: how do I recursively run array_filter($mm) in this case? My expected result here would be 4.

请注意，我没有使用任何回调，因此我可以排除 false、null 和 empty.

Please note that I am not using any callback so I can exclude false, null and empty.

推荐答案

应该可以

$count = array_sum(array_map(function ($item) {
  return ((int) !is_null($item['pts_m'])
       + ((int) !is_null($item['pts_mreg'])
       + ((int) !is_null($item['pts_cg']);
}, $array);

也许

$count = array_sum(array_map(function ($item) {
  return array_sum(array_map('is_int', $item));
}, $array);

肯定有更多可能的解决方案.如果您想使用 array_filter()(不带回调)请记住，它也将 0 视为 false，因此它会删除 数组中的任何 0 值.

There are definitely many more possible solutions. If you want to use array_filter() (without callback) remember, that it treats 0 as false too and therefore it will remove any 0-value from the array.

如果您在 5.3 之前的版本中使用 PHP，我会使用 foreach-loop

If you are using PHP in a pre-5.3 version, I would use a foreach-loop

$count = 0;
foreach ($array as $item) {
  $count += ((int) !is_null($item['pts_m'])
          + ((int) !is_null($item['pts_mreg'])
          + ((int) !is_null($item['pts_cg']);
}

<小时>

更新

关于下面的评论:

---

Update

Regarding the comment below:

Thx @kc 我实际上希望该方法删除 false、0、empty 等

Thx @kc I actually want the method to remove false, 0, empty etc

当这真的只是你想要的时候，解决方案也很简单.但是现在不知道怎么解释

When this is really only, what you want, the solution is very simple too. But now I don't know, how to interpret

我在这里的预期结果是 5.

My expected result here would be 5.

无论如何，它现在很短:)

Anyway, its short now :)

$result = array_map('array_filter', $array);
$count = array_map('count', $result);
$countSum = array_sum($count);

结果数组看起来像

Array
(
[147] => Array
    (
        [pts_mreg] => 1
        [pts_cg] => 1
    )    
[158] => Array
    (
    )

[159] => Array
    (
        [pts_mreg] => 1
        [pts_cg] => 1
    )

)

这篇关于如何在 PHP 数组中递归运行 array_filter?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！