功能：根据用户展示pn的相关信息，能搜索具体的pn, 可以分页思路：redis常用结构第一就想到了hash，可以搜索和存储信息；Sorted Set 可以搜索和截取      将Pn存储在两种结构中，先从set分页后，在去hash获取具体内容

数据格式：'用户ID1' => [    'pnNumber1' => [        'pnName' => 'E',        'pnCategory' => 'A',        'pnDesc' => 'C'    ],    'pnNumber2' => [        'pnName' => 'E',        'pnCategory' => 'A',        'pnDesc' => 'C'    ]    //...],//...redis数据格式：//sorted set'setName' => [    'pnNumber1',    'pnNumber2'],//hash 将pn号作为hash的field, 相关信息编码成json格式作为field的value'hashName' => [    'pnNumber1' => '{pnName: "E", pnCategory: "A", pnDesc: "C"}']代码实现：//add to sorted set (sorted set 可以用来排序，有个分数的概念，所以这里用time())Yii::$app->redis->zadd($this->setName, time(), $pn);//add to hash$data = [    'pn' => $pn,    'desc' => $desc,    'category' => $category];Yii::$app->redis->hset($this->hashName, $pn, json_encode($data));//分页的实现，结合redis的两种数据格式public function getPartByLimit($start, $end){    $result = [];    //先从set中取出pn(从大到小排列)    $pns = Yii::$app->redis->zrevrange($this->setName, $start, $end);    //循环pn从hash中取出相应信息    foreach ($pns as $pn) {        $result[] = json_decode(Yii::$app->redis->hget($this->hashName, $pn), true);    }    return $result;}//搜索的实现if (Yii::$app->redis->hexists($this->hashName, $pn)) {    return json_decode(Yii::$app->redis->hget($this->hashName, $pn), true);}