Question

我有一个类别数组，其中id是类别的id，parent表示类别的父ID（id 0表示最顶层的父节点），value是数组的标题。该路径最初设置为类别的ID。数组如下：

Array
(
    [0] => Array
        (
            [id] => 1
            [parent] => 0
            [value] => Corporate Files
            [path] => 1
        )

    [1] => Array
        (
            [id] => 2
            [parent] => 0
            [value] => Products Files
            [path] => 2
        )

    [2] => Array
        (
            [id] => 3
            [parent] => 1
            [value] => Communications Materials
            [path] => 3
        )

    [3] => Array
        (
            [id] => 4
            [parent] => 1
            [value] => Group Technical
            [path] => 4
        )

    [4] => Array
        (
            [id] => 5
            [parent] => 1
            [value] => New Projects
            [path] => 5
        )

    [5] => Array
        (
            [id] => 6
            [parent] => 2
            [value] => Product Range
            [path] => 6
        )

    [6] => Array
        (
            [id] => 7
            [parent] => 2
            [value] => WL4
            [path] => 7
        )
);

我想在数组中生成类别的路径。所以输出应该是

Array
(
    [0] => Array
        (
            [id] => 1
            [parent] => 0
            [value] => Corporate Files
            [path] => 1
        )

    [1] => Array
        (
            [id] => 2
            [parent] => 0
            [value] => Products Files
            [path] => 2
        )

    [2] => Array
        (
            [id] => 3
            [parent] => 1
            [value] => Communications Materials
            [path] => 1,3
        )

    [3] => Array
        (
            [id] => 4
            [parent] => 1
            [value] => Group Technical
            [path] => 1,4
        )

    [4] => Array
        (
            [id] => 5
            [parent] => 1
            [value] => New Projects
            [path] => 1,5
        )

    [5] => Array
        (
            [id] => 6
            [parent] => 2
            [value] => Product Range
            [path] => 2,6
        )

    [6] => Array
        (
            [id] => 7
            [parent] => 2
            [value] => WL4
            [path] => 2,7
        )
);

我写了以下功能。

   function findparent($id,$path){
        global $categories;
        global $catcnt;

        if($id==0){
            echo $path."<br />"; //this outputs path currently
            return $path;
        }
        for($i=0;$i<$catcnt;$i++){

            if($id==$categories[$i]['id']){
                $path=$id.",".$path;
                findparent($categories[$i]['parent'],$path);
            }
        }
    }

for($i=0;$i<count($categories);$i++){
             $categories[$i]['path']=(string)findparent($categories[$i]['parent'],$categories[$i]['id']); //this doesnt assign it currectly

    }

，输出为：

Array
(
    [0] => Array
        (
            [id] => 1
            [parent] => 0
            [value] => Corporate Files
            [path] => 
        )

    [1] => Array
        (
            [id] => 2
            [parent] => 0
            [value] => Products Files
            [path] => 
        )

    [2] => Array
        (
            [id] => 3
            [parent] => 1
            [value] => Communications Materials
            [path] => 
        )

    [3] => Array
        (
            [id] => 4
            [parent] => 1
            [value] => Group Technical
            [path] => 
        )

    [4] => Array
        (
            [id] => 5
            [parent] => 1
            [value] => New Projects
            [path] => 
        )

    [5] => Array
        (
            [id] => 6
            [parent] => 2
            [value] => Product Range
            [path] => 
        )

    [6] => Array
        (
            [id] => 7
            [parent] => 2
            [value] => WL4
            [path] => 
        )
);

我哪里错了？

Answer 1

findparent仅在id为零时才会返回。

在递归findparent调用之前，您需要第二个return语句。

Answer 2

由于您不需要处理多个级别，因此您可以通过一个简单的foreach直接使用数组本身来完成它自身的功能。

foreach ($array as &$node)
{
        if ($node['parent'])
        {
                $node['path'] = $node['parent'] . ',' . $node['path'];
        }
}
unset($node);

但是，您可以将其置于其自身的功能中，但就我所见，您不需要任何全局变量。

你在这里看到的是简单的字符串连接，这就像你想要的那样创建数组。我的第一个评论更多的是用n深度而不是1深度来管理结构。 Demo

值未分配给变量

2 个答案: