Laravel - 从multidimentional数组中删除具有NULL值的元素

Question

我在用Laravel 5.3.

我multidimensional array喜欢:

Array
(
    [id] => 37141
    [last_done_on] => []
    [children] => Array
        (
            [0] => NULL /* This must be removed */
            [1] => Array
                (
                    [id] => 37142
                    [last_done_on] => Array()
                    [children] => Array()
                )

            [2] => Array
                (
                    [id] => 37143
                    [last_done_on] => Array()
                    [children] => Array
                        (
                            [0] => Array
                                (
                                    [id] => 37144
                                    [last_done_on] => Array()
                                    [children] => Array()
                                )
                            [1] => Array
                                (
                                    [id] => 37145
                                    [last_done_on] => Array()
                                    [children] => Array()
                                )
                        )
                )
            [3] => Array
                (
                    [id] => 37157
                    [last_done_on] => Array()
                    [children] => Array
                        (
                            [0] => Array
                                (
                                    [id] => 37158
                                    [last_done_on] => Array()
                                    [children] => Array()
                                )
                            [1] => Array
                                (
                                    [id] => 37159
                                    [last_done_on] => Array()
                                    [children] => Array
                                        (
                                            [0] => NULL  /* This must be removed */
                                        )
                                )
                        )
                )
        )
)

而我想remove的elements是NULL.所以结果应该是这样的:

Array
(
    [id] => 37141
    [last_done_on] => []
    [children] => Array
        (
            [0] => Array
                (
                    [id] => 37142
                    [last_done_on] => Array()
                    [children] => Array()
                )

            [1] => Array
                (
                    [id] => 37143
                    [last_done_on] => Array()
                    [children] => Array
                        (
                            [0] => Array
                                (
                                    [id] => 37144
                                    [last_done_on] => Array()
                                    [children] => Array()
                                )
                            [1] => Array
                                (
                                    [id] => 37145
                                    [last_done_on] => Array()
                                    [children] => Array()
                                )
                        )
                )
            [2] => Array
                (
                    [id] => 37157
                    [last_done_on] => Array()
                    [children] => Array
                        (
                            [0] => Array
                                (
                                    [id] => 37158
                                    [last_done_on] => Array()
                                    [children] => Array()
                                )
                            [1] => Array
                                (
                                    [id] => 37159
                                    [last_done_on] => Array()
                                    [children] => Array
                                        (
                                        )
                                )
                        )
                )
        )
)

这该怎么做？

Answer 1

在集合中，使用过滤器

some_collection->filter(function($value, $key) {
    return  $value != null;
});

Answer 2

如果要删除null值而不是空数组，则可以执行以下操作：

function array_remove_null($item)
{
    if (!is_array($item)) {
        return $item;
    }

   return collect($item)
        ->reject(function ($item) {
            return is_null($item);
        })
        ->flatMap(function ($item, $key) {

            return is_numeric($key)
                ? [array_remove_null($item)]
                : [$key => array_remove_null($item)];
        })
        ->toArray();
}

$newArray = array_remove_null($array);

希望这可以帮助！