不能理解多次嵌套数组的逻辑

3 回答

• 1

  我将初始数据保留为对象，因为我想使用array_walk_recursive()查找要添加节点的点。但是基本逻辑是查找具有父节点的任何节点，然后搜索所有叶节点以查找该节点是否是父节点。如果是，则只需添加节点...

  usort($full_menu, function($a, $b){
      return strcmp($a->menu_order, $b->menu_order);
  });
  
  foreach ($full_menu as $key=>$menu )   {
      if ( $menu->parent != 0 ) {
          array_walk_recursive($full_menu, function (&$data) use ($menu)   {
              if ( $data->id == $menu->parent)    {
                  $data->children[] = $menu;
              }
          });
      }
  }
  
  function translate ( &$menu )    {
      foreach ( $menu as &$menuItem )  {
          $out = array(
              'id' => $menuItem->id,
              'text' => $menuItem->title,
              'href' => $menuItem->link,
              'icon' => $menuItem->icon,
              'target' => $menuItem->target,
              'title' => $menuItem->name,
              'order' => $menuItem->menu_order,
              'parent' => $menuItem->parent
          );
          if ( isset($menuItem->children))    {
              $out['children'] = $menuItem->children;
              translate($out['children']);
          }
          $menuItem = $out;
      }
      unset ( $menuItem );
  }
  translate ($full_menu);
  $full_menu = array_filter ( $full_menu, function ($data ) { return $data['parent'] == 0;});
  
  print_r($full_menu);
  

  我添加的最后一部分将把元素重新格式化为所需的数组格式，然后过滤掉根菜单，以删除所有已移动的项目。

  回复于 2024-04-20T10:37:24+08:00
• 1

  在 get_all 函数的第一个 foreach 中，每次$fm-> parent！= 0(这意味着每个子元素都保存到数组的第一级)时，都将$full_menu arrach 的元素添加到$mega_menu。接下来，您要处理孩子。您只能(在数组的第一个维度上)保存$fm-> parent == 0 的那些元素。可以通过更改 get_all 中的条件来实现。

  function array_search_multidim($array, $column, $key){
      return (array_search($key, array_column($array, $column)));
  }
  
  public function get_all() {
      $full_menu = $this->Site_model->get_all_menu();
      usort($full_menu, function($a, $b){
          return strcmp($a->menu_order, $b->menu_order);
      });
  
      foreach($full_menu as $fm) {
          if($fm->parent == 0) {
              $mega_menu[] = array(
                  'id' => $fm->id,
                  'text' => $fm->title,
                  'href' => $fm->link,
                  'icon' => $fm->icon,
                  'target' => $fm->target,
                  'title' => $fm->name,
                  'order' => $fm->menu_order,
                  'parent' => $fm->parent
              );
          } else {
              $child_menu[] = array(
                  'id'        => $fm->id,
                  'text'      => $fm->title,
                  'href'      => $fm->link,
                  'icon'      => $fm->icon,
                  'target'    => $fm->target,
                  'title'     => $fm->name,
                  'order'     => $fm->menu_order,
                  'parent'    => $fm->parent
              );
          }
      }
  
      foreach($child_menu as $cm) {
          $mega_menu[$this->array_search_multidim($mega_menu,'id',$cm['parent'])]['children'][] = array(
              'id'        => $cm['id'],
              'text'      => $cm['text'],
              'href'      => $cm['href'],
              'icon'      => $cm['icon'],
              'target'    => $cm['target'],
              'title'     => $cm['title'],
              'order'     => $cm['order'],
              'parent'    => $cm['parent']
          );
      }
  
      echo '<pre>';
      print_r($mega_menu);
      echo '</pre>';
  }
  

  回复于 2024-04-20T10:37:24+08:00
• -1

  如果要从数组中删除元素，可以使用 unset。例如

  unset($mega_menu[4][0]);
  

  回复于 2024-04-20T10:37:24+08:00