PHPで開発したショッピングモールの商品分類機能のデザインアイデア

CREATE TABLE `category` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL,
  `parent_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
);

class Category {
  private $connection;

  public function __construct($connection) {
    $this->connection = $connection;
  }

  // 获取所有分类
  public function getAllCategories() {
    $query = "SELECT * FROM category";
    $result = mysqli_query($this->connection, $query);
    return mysqli_fetch_all($result, MYSQLI_ASSOC);
  }

  // 根据ID获取分类
  public function getCategoryById($id) {
    $query = "SELECT * FROM category WHERE id = $id";
    $result = mysqli_query($this->connection, $query);
    return mysqli_fetch_assoc($result);
  }

  // 创建分类
  public function createCategory($name, $parentId) {
    $query = "INSERT INTO category (name, parent_id) VALUES ('$name', $parentId)";
    return mysqli_query($this->connection, $query);
  }
  
  // 更新分类
  public function updateCategory($id, $name, $parentId) {
    $query = "UPDATE category SET name = '$name', parent_id = $parentId WHERE id = $id";
    return mysqli_query($this->connection, $query);
  }

  // 删除分类
  public function deleteCategory($id) {
    $query = "DELETE FROM category WHERE id = $id";
    return mysqli_query($this->connection, $query);
  }
}

function renderCategories($categories, $parent_id = 0, $level = 0) {
  foreach ($categories as $category) {
    if ($category['parent_id'] == $parent_id) {
      echo str_repeat('  ', $level * 2);  // 根据层级添加缩进
      echo $category['name'] . '<br>';
      renderCategories($categories, $category['id'], $level + 1);
    }
  }
}

// 获取所有分类并渲染
$categories = $category->getAllCategories();
renderCategories($categories);