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我正在使用 Kohana 3.3 并尝试将页面输出到菜单和所有子菜单。子菜单与页面存储在同一个表中，称为页面。页面和子菜单之间的唯一区别是标志。这是页面的表结构和我为使其正常工作而创建的示例页面。

|  id  |  title  |  layout    |  content    |  is_menu  |  parent  |  position  |
|  1   |  Home   |  home.php  |  Lipsum...  |     0     |    0     |     1      |
|  3   |  Menu1  |  none      |             |     1     |    0     |     2      |
|  2   |  Expl1  |  view.php  |  Lipsum...  |     0     |    0     |     3      |
|  5   |  MPge2  |  view.php  |  Lipsum...  |     0     |    3     |     1      |
|  4   |  MPge1  |  view.php  |  Lipsum...  |     0     |    3     |     2      |

我将所有页面作为 ORM 对象加载到一个数组中，按父级排序，然后按位置排序。当查询获取它们时，我已经订购了上面的表格。这是我生成 HTML 菜单的 PHP 方法，然后我将 ORM 页面数组传递到：

class Controller_Page extends Controller_Table {

/**
 * Ourput the menu for editing purposes. Include add new page buttons.
 *
 * @return  body
 */
public function action_acp_menu()
{
    $view = View::factory('acp/layouts/pages/menu')
        ->bind('menu_pages', $menu_pages);
    $pages = ORM::factory('Page')
        ->order_by('parent')
        ->order_by('position')
        ->find_all();
    $menu_pages = $this->menu($pages);
    $this->response->body($view->render());
}

/**
 * Output the pages in a menu format, with optional add more buttons if 
 * we're in the ACP. This returns a string of LIs without a wrapping UL.
 *
 * @param   ORM     $pages    ORM object of pages.
 * @param   integer $parent   Output all children of this parent.
 * @return  string
 */
private function menu($pages, $parent = 0)
{
    $html = '';
    $is_acp = (strpos(Request::initial()->uri(), 'acp') !== FALSE);
    echo "<br>Testing pages against parent: $parent<br>";
    foreach ($pages as $page)
    {
        echo "Page: ".$page->id."; Parent: ".$page->parent."<br>";
        if ($page->parent == $parent)
        {
            echo "Page belongs to the parent.<br>";
            if ($page->is_menu)
            {
                echo "Page ".$page->id." is a menu. Loading children.<br>";
                $children = $this->menu($pages, $page->id);
                if ($children OR $is_acp)
                {
                    echo "Children found (or we're in the ACP). Adding pages to the menu.<br>";
                    $html .= '<li class="dropdown" data-id="'.$page->id.'">'.($is_acp ? '
                        <span class="handle">::</span>' : '').'
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                            '.$page->title.'
                            <b class="caret"></b>
                        </a>
                        <ul class="dropdown-menu'.($is_acp ? ' sortable-child' : '').'" data-id="'.$page->id.'">
                            '.$children.'
                        </ul>
                    </li>';
                }
            }
            else
            {
                echo "Page ".$page->id." is not a menu. Outputting normal.<br>";
                $html .= '<li data-id="'.$page->id.'">'.($is_acp ? '
                    <span class="handle">::</span>' : '').'
                    <a href="/acp/pages/edit'.$page->id.'">'.$page->title.'</a>
                </li>';
            }
        }
        echo "Finished processing page ".$page->id."<br>";
    }
    echo "Finished looping all pages<br>";
    if ($is_acp)
    {
        $html .= '<li class="add-page">
            <a href="/acp/pages/create?parent='.$page->id.'">+ Add page</a>
        </li>';
    }
    echo "Finished testing against parent: $parent<br>";
    return $html;
}

正如你所看到的，我已经放了一堆回声来试图弄清楚发生了什么。这是所有回声的输出：

Testing pages against parent: 0
Page: 1; Parent: 0
Page belongs to the parent.
Page 1 is not a menu. Outputting normal.
Finished processing page 1
Page: 3; Parent: 0
Page belongs to the parent.
Page 3 is a menu. Loading children.

Testing pages against parent: 3
Page: 1; Parent: 0
Finished processing page 1
Page: 3; Parent: 0
Finished processing page 3
Page: 2; Parent: 0
Finished processing page 2
Page: 5; Parent: 3
Page belongs to the parent.
Page 5 is not a menu. Outputting normal.
Finished processing page 5
Page: 4; Parent: 3
Page belongs to the parent.
Page 4 is not a menu. Outputting normal.
Finished processing page 4
Finished looping all pages
Finished testing against parent: 3
Children found (or we're in the ACP). Adding pages to the menu.
Finished processing page 3
Finished looping all pages
Finished testing against parent: 0

因此，在第二次调用子菜单（ID 3）的 menu 方法后，foreach 循环完成了 ID 3，但不会继续到下一页。我不明白为什么？我过去做过这样的 foreach 循环，但这是我第一次在 Kohana 中这样做，所以认为这是与 Kohana 相关的东西，我不明白。

我已经创建了this 的eval.in，显示代码有效，并且它必须是 Kohana 中的某些东西这样做。这是来自 eval.in 的所有回声的结果：

Testing pages against parent: 0
Page: 1; Parent: 0
Page belongs to the parent.
Page 1 is not a menu. Outputting normal.
Finished processing page 1
Page: 3; Parent: 0
Page belongs to the parent.
Page 3 is a menu. Loading children.

Testing pages against parent: 3
Page: 1; Parent: 0
Finished processing page 1
Page: 3; Parent: 0
Finished processing page 3
Page: 2; Parent: 0
Finished processing page 2
Page: 5; Parent: 3
Page belongs to the parent.
Page 5 is not a menu. Outputting normal.
Finished processing page 5
Page: 4; Parent: 3
Page belongs to the parent.
Page 4 is not a menu. Outputting normal.
Finished processing page 4
Finished looping all pages
Finished testing against parent: 3
Children found (or we're in the ACP). Adding pages to the menu.<br>
Finished processing page 3
Page: 2; Parent: 0
Page belongs to the parent.
Page 2 is not a menu. Outputting normal.
Finished processing page 2
Page: 5; Parent: 3
Finished processing page 5
Page: 4; Parent: 3
Finished processing page 4
Finished looping all pages
Finished testing against parent: 0

正如您所看到的，与 Kohana 不同，在第 3 页完成处理后，它会按预期继续到第 2 页。为什么小花不这样做呢？

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2 回答 2

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我找到了问题和解决方案。Kohana 通过引用处理 ORM 对象。我不知道为什么这会阻止我的 foreach 循环完成，但确实如此。

解决方案是遍历 ORM 对象一次，将每个页面的详细信息存储在 stdClass' 数组中。这样它们就不是参考了，所以当我将新数组传递给我的方法时，它就起作用了。

如果其他人可以发布更完整的答案来解释为什么引用对象数组存在此问题，我将不胜感激。

于 2014-12-11T10:47:29.153 回答
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我不知道为什么会这样，但我认为这个解决方案会有所帮助：

更改您的查询，使 find_all 成为 execute(null, true); 它将返回一个对象，并且应该可以正常工作。

如果这不是重点，那么这只是 Kohana 中的一个错误。

于 2014-12-11T10:50:25.637 回答