Question

我正在尝试使用父子关系构建分层关联数组。输入数据以元素数组的形式出现。每个元素都有一个id和一个父id。

为了提高效率，当一个元素找到它的父元素时，我想从源数据中删除那个子元素，这样就不会浪费周期来检查该元素是否是其他元素的子元素。

以下是代码：

// parentid == 0 indicates a root node
function buildTree(&$elements, $parentid=0){
    $branch = array();

    foreach($elements as $key => $element){
        if($element['parentid'] == $parentid){
            $twig = $element;
            unset($elements[$key]);
            $twig['children'] = buildTree($elements, $element['pageid']);
            $branch[] = $twig;
        }
    }

    return $branch;
}

我遇到的问题是，在某些情况下，某些元素永远不会找到他们的父母。

我认为这种情况正在发生，因为$elements变量正在通过引用传递，更深层次的递归破坏了外部级别的内部数组指针的位置，导致其他子项被跳过而未被触及在外层的foreach循环中。

我试图看看是否有一种方法可以在进入另一个递归级别之前保存内部数组指针的位置，然后在函数返回时恢复位置，但它不会出现这在PHP中是可行的。

如果我将&取出来不通过引用传递$elements变量，那么该函数可以正常工作。不幸的是，即使这些元素已被保存在其正确的父级之下，也会留下由foreach处理的元素，浪费了一些处理时间。

有关如何将未分类的元素池中的子元素分配给其父元素之后如何删除子元素的任何想法？

编辑：当然，一些示例数据会有所帮助：

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$source_data是未分类的源数据，$correct_result是我通过引用传递$elements时得到的结果（这是我想要的），{{1}我通过引用传递$by_reference时得到的结果（错误的结果）。

Answer 1

你必须在unset之后重新索引$ elements数组，试试这个..

unset($elements[$key]);
$temp_array=array_values($elements);
$twig['children'] = buildTree($temp_array, $element['id']);

PHP内部数组指针问题，带有foreach的递归函数中的引用传递的变量

1 个答案: