20020117-使用递归方法来格式化菜单-php培训线上九期班

使用递归来获取树形菜单的方法

方法一

private function getTreeItems($items)
{
    $tree = [];
    foreach ($items as $item){
        if (isset($items[$item['pid']])){
            $items[$item['pid']]['children'][] = &$items[$item['mid']];
        }else{
            $tree[] = &$items[$item['mid']];
        }
    }
    return $tree;
}

方法二

    private function getTree($items,$pid=0)
{
    $tree = [];
    foreach ($items as $item){
        if ($item['pid'] == $pid){
            $tree[$item['mid']] = $item;
            $tree[$item['mid']]['children'] = $this->getTree($items,$item['mid']);
        }
    }
    return $tree;
}

将无线级菜单格式化为二给菜单的方法

private function formatTree($items,&$res=[])
    {
        foreach ($items as $key => $item){
            if (isset($item['children'])){
                $tem = $item['children'];
                unset($item['children']);
                $res[] = $item;
                $this->formatTree($tem,$res);
            }else{
                $res[] = $item;
            }
        }
        return $res;
    }

二级菜单前端遍历需要注意的问题

再进行第二级遍历进，一定要判断是否有二级菜单，如果没有判断，会报错

<div class="menu_dropdown bk_2">
        @foreach($menus as $menu)
        <dl id="menu-article">
            <dt><i class="Hui-iconfont">&#xe616;</i> {{$menu['title']}}<i class="Hui-iconfont menu_dropdown-arrow">&#xe6d5;</i></dt>
            @if(isset($menu['children']) && $menu['children'])
            <dd>
                @foreach($menu['children'] as $m)
                <ul>
                    <li><a href="javascript:;"  controller = "{{$m['controller']}}" action = "{{$m['action']}}" onclick="menu_fire(this)"
                           "title="资讯管理">{{$m['title']}}</a>
                    </li>
                </ul>
                @endforeach
            </dd>
            @endif
        </dl>
        @endforeach
    </div>