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Home Backend Development PHP Tutorial php中memcached怎么存多维数组

php中memcached怎么存多维数组

May 17, 2018 pm 02:18 PM
memcached php


我想问下php中memcached怎么存多维数组?
比如我想缓存多个用户发的帖子标题,数组形式是这样的:

php$user1=array(
    array('title'=>'帖子1','time'=>'2015-07-08'),
    array('title'=>'帖子2','time'=>'2015-07-09'),
);
Copy after login
Copy after login

假设user1的UID是1001,我想通过UID得到他所发的帖子缓存,不知道怎么弄。
另外Redis里面也能用吗?
求大虾指点,感激不尽。

回复内容:

我想问下php中memcached怎么存多维数组?
比如我想缓存多个用户发的帖子标题,数组形式是这样的:

php$user1=array(
    array('title'=>'帖子1','time'=>'2015-07-08'),
    array('title'=>'帖子2','time'=>'2015-07-09'),
);
Copy after login
Copy after login

假设user1的UID是1001,我想通过UID得到他所发的帖子缓存,不知道怎么弄。
另外Redis里面也能用吗?
求大虾指点,感激不尽。

PHP的Memcached的驱动会自动进行serialize和unserialize,你所需要做的是:
1. 选取一个合适key,比如 "POST_OF_USER_" . $userId
2. 调用set函数把数据丢进去就行了

示例代码:

// 0. 准备:
$cache = new Memcache();
$cache->connect('127.0.0.1', 11211); // 请替换为你的memcache服务器地址和端口
$userId = // 你自己想办法获取...

// 1. 构造cache KEY
$cacheKey = "POSTS_OF_USER_" . $userId;

// 2. 从缓存中获取数据
$posts = $cache->get($cacheKey);
if ($posts === false){ 
    // 3. 缓存失效了,加载数据
    $posts = // 你自己想办法加载数据

    // 4. 保存数据到缓存中
    $cache->set($cacheKey, $posts);    
}

// OK,可以使用posts了
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1.memcache或者redis键值只能是字符串或者整型数组,所以数组必须串行化
2.serialize,json_encode皆可以串行化
3.PHP建议用serialize

    $array  = array();
    $string = serialize($array);
    $memcache->set('key',$string);
    $result = $memcache->get('key');
    $result = unserialize($result);
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array('user1Id'=>array(
                        array('title'=>'帖子1','time'=>'2015-07-08'),
                        array('title'=>'帖子2','time'=>'2015-07-09')
                       ),
       'user2Id'=>array()
      )
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这样可否

key:prefix + userId
value:[{"title":"\u5e16\u5b501","time":"2015-07-08"},{"title":"\u5e16\u5b502","time":"2015-07-09"}]
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memcache只支持基本的数据存储,如字符串,不支持复杂结构如map等
所以结构化的数据,可以串行化后作为值存储。
串行化的方法有很多,比如json_encode();

数组不用转成字符串,直接存数组就行了

我是使用 json_encode 配合 urlencode 来序列化结果集,之后再保存在memcache中

memcache的话,建议序列化或者json_encode成string之后进行存储。redis有更丰富的数据类型,也可以考虑,hashset。

转成json字符串扔进去

你可以直接存数据进去都是可以的,Mecached扩展底层会帮你处理的。

多个用户是多少? 如果是可知的 推荐还是用json_encode()后,存入到memcache中,按三维数组的结构,并不推荐serialize

看看官方示例吧,不需要自己把数组进行序列化:

addServer('localhost', 11211);

$m->set('int', 99);
$m->set('string', 'a simple string');
$m->set('array', array(11, 12));
/* 'object'这个key将在5分钟后过期 */
$m->set('object', new stdclass, time() + 300);


var_dump($m->get('int'));
var_dump($m->get('string'));
var_dump($m->get('array'));
var_dump($m->get('object'));
?>
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memcached可以存字符串,数组,对象,整形多种类型,自动序列化。

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