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如何在PHP数组中递归地向对象添加层

php-7 recursion php

-3

user1129107 · 技术社区 · 6 年前

我在一个数组中有一组分层的对象,并希望使用PHP递归地循环它们,以添加相应的层。我该怎么做?

注意:阵列的结构可能比图中显示的要深得多。

Array
(
    [0] => stdClass Object //should be tier 1
        (
            [name] => Object name
            [children] => Array
                (
                    [0] => stdClass Object //should be tier 2
                        (
                            [name] => Object name
                            [children] => Array
                                (
                                    [0] => stdClass Object //should be tier 3
                                        (
                                            [name] => Object name
                                            [children] => Array
                                                (
                                                )
                                        )
                                    [1] => stdClass Object //should be tier 3
                                        (
                                            [name] => Object name
                                            [children] => Array
                                                (
                                                )
                                        )
                                )
                        )
                    [1] => stdClass Object //should be tier 2
                        (
                            [name] => Object name
                            [children] => Array
                                (
                                    [0] => stdClass Object //should be tier 3
                                        (
                                            [name] => Object name
                                            [children] => Array
                                                (
                                                )
                                        )
                                )
                        )
                )
        )
    [1] => stdClass Object //should be tier 1
        (
            [name] => Object name
            [children] => Array
                (
                )
        )
)

1 回复 | 直到 6 年前

fubar 6 年前

问题其实很简单。

您需要迭代结构的每个级别,设置层,当您遇到具有子节点的节点时,递归调用相同的函数,但增加层值。

我用过 json_decode 更轻松地创建 stdClass 对象,您可以在此处看到其工作: https://3v4l.org/oCJUV

<?php

function setTier(array $nodes, $tier = 1)
{
    return array_map(function ($node) use ($tier) {
        $node->tier = $tier;
        $node->children = setTier($node->children, $tier + 1);

        return $node;
    }, $nodes);
}

$structure = json_decode('
    [{
        "name": "a",
        "children": [{
            "name": "c",
            "children": [{
                "name": "e",
                "children": [{
                    "name": "g",
                    "children": []
                }]
            }, {
                "name": "f",
                "children": []
            }]
        }, {
            "name": "d",
            "children": [{
                "name": "h",
                "children": []
            }]
        }]
    }, {
        "name": "b",
        "children": []
    }]
');

$structure = setTier($structure);

print_r($structure); die;