onethink面包屑导航

/**
 * 面包屑导航
 */
function position($category_id){
    $positionUrl = position_category($category_id);
    return $positionUrl;
}
/**
 * 面包屑父级导航链接数据
 */
function position_category($category_id,$num=0){
    $categoryList = M('Category')->where(array('id'=>$category_id))->field('id,name,title,pid')->find();
    $arr = array();
    if($categoryList){
        //存在
        $num++;
        //加入数据
        $arr[$num]  =   $categoryList;
        $arr[$num]['url'] = U('Article/lists?category='.$categoryList['name']);
        //递归合并
        $arr = array_merge(position_category($categoryList['pid'],$num),$arr);   
    }
    //加入首页
    $arr[0] = array(
        'id'       =>  0,
        'name'     =>  'Home',
        'url'      =>  U('/Index/index'),
        'title'    =>  '首页',
        'pid'      =>  0,
    );
    //返回数组
    return $arr;
}