Question

下面是我拥有的数组的结构。我有两个问题：

如何在数组中获取数组的位置？

例如，如何在[post_id] => 2782内获取元素[2772] => Array的数组位置（答案应为4）？

如何获取数组中子数组的数量？

例如，如何获得元素为[post_id] => 2779的数组的子数组（答案应为2）？

Array
(
    [2772] => Array
    (
        [post_id] => 2772
        [children] => Array
        (
            [0] => Array
            (
                [post_id] => 2774
                [children] => Array
                (
                    [0] => Array
                    (
                        [post_id] => 2779
                        [children] => Array
                        (
                            [0] => Array
                            (
                                [post_id] => 2782
                                [children] => Array
                                (
                                )
                            )

                            [1] => Array
                            (
                                [post_id] => 2781
                                [children] => Array
                                (
                                )
                            )
                        )
                    )

                    [1] => Array
                    (
                        [post_id] => 2780
                        [children] => Array
                        (
                            [0] => Array
                            (
                                [post_id] => 2784
                                [children] => Array
                                (
                                )
                            )
                        )
                    )
                )
            )

            [1] => Array
            (
               [post_id] => 2775
               [children] => Array
               (
               )
            )

            [2] => Array
            (
                [post_id] => 2776
                [children] => Array
                (
                )
            )
        )
    )
)

Answer 1

您可以使用此功能计算所有孩子：

function GetChildrenQuantity($element){
    $quantity = count($element->children);

    $childrenQuantity = 0;
    for($i=0;$i<$quantity;$i++){
       $childrenQuantity += GetChildrenQuantity($element->children[i]); 
    }

    return $quantity + $childrenQuantity;

}

您可以像这样调用此函数：

$total = GetChildrenQuantity($yourArray[2772]);

如果您想以这种方式找到元素：

function FindElementIn($list, $id){
    $element = null;
    $quantity = count($list->children);        

    for($i=0;$i<$quantity;$i++){
        if ($list->children[i]->post_id == $id) 
            return $element->children[i];
        else {
            $element = FindElementIn($list->children[i]->children, $id); 
            if ($element != null) return $element;
        }
    }

    return null;

}

计算数组中子数组的数量

1 个答案: