分层树视图类别并排写入

Question

我有分层类别。我想在 table 中打印它们。我希望它在 table.

的每一行中写入子类别和主类别 示例：

电子
电子产品 > 计算机
电子产品 > 电脑 > 配件
电子产品 > 电脑 > 配件 -> 鼠标
电子产品 > 电脑 > 配件 -> 键盘
化妆品
化妆品 > 护肤
化妆品 > 护肤 > 护肤霜
化妆品 > 护肤 > 面膜

我试过这个功能。它没有用。

public function getSubCats($Categories)
    {
        foreach($Categories as $category){
            if(count($category->subcategory)){
                $this->getSubCats($category->subcategory);
                return $category->subcategory;
            }else{
                return $category->subcategory;
            }
        }
    }

类别数据库table

id	parent_id	name
1	NULL	Electronics
2	1	Computers
3	2	Accessories
4	3	Keyboards
5	NULL	Cosmetics
6	5	Skin Care
7	6	Skin Cream
8	7	Skin Mask

索引blade类别table（子类别无限制）

Category Name	Action
Electronics	Edit
Electronics - Computers	Edit
Electronics - Computers - Accessories	Edit
Electronics - Computers - Accessories - Keyboards	Edit
Cosmetics	Edit
Cosmetics - Skin Care	Edit
Cosmetics - Skin Care - Skin Cream	Edit
Cosmetics - Skin Care - Skin Mask	Edit

你能帮帮我吗？谢谢。

Answer 1

我使用 0（零）而不是 NULL 来确定顶级类别，因为从 MySQL 获取结果的方式不同。

where column = 1/2/3/4

对

where column is NULL

当使用 0（零）时，我可以使用相同的准备语句。

这是我想出的：

function get_cat_by_parent( $pdo, $id ) {
    $sql    = "SELECT * FROM Whosebug.categories WHERE parent_id = ?";
    $stmt   = $pdo->prepare( $sql );
    try {
        $stmt->execute([$id]);
        $data   = $stmt->fetchALL( PDO::FETCH_ASSOC );
    } catch (PDOException $e ) {
        // exception
    }
    return $data;
}

function recursive( $pdo, $array, $depth, $label ) {
    $depth++;
    $data   = get_cat_by_parent( $pdo, $array['id'] );
    if(count($data)) {
        foreach( $data as $row) {
            echo $label;
            echo " &#x2192; ";
            echo $row['name'];
            echo "<br />";
            recursive( $pdo, $row, $depth, $label . " &#x2192; " . $row['name'] );
        }
    }
}

$parents    = get_cat_by_parent( $pdo, 0 );
foreach( $parents as $row ) {
    echo $row['name'];
    echo "<br />";
    recursive( $pdo, $row, 0, $row['name'] );
}

输出：

Electronics
Electronics → Computers
Electronics → Accessories
Electronics → Accessories → USB Hub
Electronics → Accessories → Memory Card Readers
Electronics → Accessories → Mic Stand
Electronics → Keyboards
Cosmetics
Cosmetics → Skin Care
Cosmetics → Skin Cream
Cosmetics → Skin Cream → Oil of Olaz
Cosmetics → Skin Cream → Something
Cosmetics → Skin Cream → Other
Cosmetics → Skin Mask

我在你的测试数据中添加了几个类别。

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