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这里真的有两个问题;为什么会这样?可以做些什么呢?

抱歉这个问题太长了,但大部分只是print_r输出!

基本上,我从一个扁平的标签数组 ( $tags) 开始,每个标签都有一个id(数组索引),name并且parent_id. 然后我递归迭代$tags并将所有子标签嵌套在它们的父标签中。(见下文)

有用!(见下文输出)。但是我遇到的问题是我的平面标签数组是从执行嵌套/递归的函数中写入的。(见下文)

标签的扁平数组:

Array
(
    [1] => stdClass Object
        (
            [name] => instruments
            [parent_id] => 0
        )

    [2] => stdClass Object
        (
            [name] => strings
            [parent_id] => 1
        )

    [3] => stdClass Object
        (
            [name] => violin
            [parent_id] => 2
        )

    [4] => stdClass Object
        (
            [name] => cello
            [parent_id] => 2
        )

    [5] => stdClass Object
        (
            [name] => woodwind
            [parent_id] => 1
        )

    [6] => stdClass Object
        (
            [name] => flute
            [parent_id] => 5
        )
)

这是嵌套子标签的递归调用函数。问题在于if:我分配$tag给它$tree[$i],然后将children属性添加到它。这导致children属性被添加到$tag. 这就是我想要停止发生的事情。

public function tags_to_tree($tags, $parent_id = 0)
{
    $tree = array();
    foreach($tags as $i => $tag)
    {
        // add this tag node and all children (depth-first recursive)
        if(intval($parent_id) === intval($tag->parent_id))
        {
            $tree[$i] = $tag;
            $tree[$i]->children = $this->tags_to_tree($tags, $i);
        }
    }
    return $tree;
}

嵌套标签输出:

Array
(
    [1] => stdClass Object
        (
            [name] => instruments
            [parent_id] => 0
            [children] => Array
                (
                    [2] => stdClass Object
                        (
                            [name] => strings
                            [parent_id] => 1
                            [children] => Array
                                (
                                    [3] => stdClass Object
                                        (
                                            [name] => violin
                                            [parent_id] => 2
                                        )

                                    [4] => stdClass Object
                                        (
                                            [name] => cello
                                            [parent_id] => 2
                                        )
                                )
                        )

                    [5] => stdClass Object
                        (
                            [name] => woodwind
                            [parent_id] => 1
                            [children] => Array
                                (
                                    [6] => stdClass Object
                                        (
                                            [name] => flute
                                            [parent_id] => 5
                                        )
                                )
                        )
                )
        )
)

children将属性添加到$tree[$i]或分配$tag$tree[$i]以阻止这种情况发生时,我可以做些什么不同的事情?

谢谢!

4

1 回答 1

2

平面数组是一个对象数组(引用),即使您将对象放入一个新数组中,它仍然是您正在移动的同一个对象。

如果您不想编辑相同的参考,请查看对象克隆

即使用:

$tree[$i] = clone $tag;
于 2011-03-12T12:01:12.877 回答