PHP使用cookie做浏览历史记录

/**
 * @param $article文章详情
 * @param int $count记录数
 * tp须引入cookie类
 */
function addHistory($article,$count=5)
{
    if(!Cookie::has('history')){
        Cookie::set('history','');
    }
    $history=unserialize(Cookie::get('history'));
    $id=$article['id'];
    if(isset($history[$id])){
        unset($history[$id]);
    }
    $history[$id]=$article['title'];//文章id作为键
    if(count($history)>$count){
        unset($history[key($history)]);
    }
    Cookie::set('history',serialize($history));
}
/**
 * @return array|mixed|string获得历史记录
 */
function getHistory()
{
    if(!Cookie::has('history')){
        return '';
    }
    $history=unserialize(Cookie::get('history'));
    $history=array_reverse($history,true);//倒序
    return $history;
}