PHP calls MEMCACHE caching technology example

In projects, when large amounts of visits are involved, reasonable use of cache can reduce the pressure on the database and improve user experience. That is, under the premise of non-real-time requirements, within a short period of time (several seconds), the data used for display is obtained from the cache without directly reading the database, which can effectively reduce the reading pressure of the database. Here is a record of the use of memcache in PHP language:

First, we create a memcachepool, which can be read according to different configurations and generate different memcache instances. Use $memcache->addServer($host,$port,$flag); to add a memcache server to the connection pool. The code example is as follows:

class memcachePool{
     private static $instance;
     private $memcacheList = array();
    private function __construct(){

    }
     public static function getInstance(){
         if(self::$instance != null)
             return self::$instance;
         self::$instance = new memcachePool();
         return self::$instance;
     }
    /**
     * get memcache object from pool
     * @param  [type] $host 服务器
     * @param  [type] $port 端口
     * @param  [type] $flag 控制是否使用持久化连接。默认TRUE
     * @return [type]
     */
     public function getMemcache($host,$port,$flag){
         if(isset($this->memcacheList[$host.$port]))
             return $this->memcacheList[$host.$port];

        $memcache = new Memcache();
        // 向连接池中添加一个memcache服务器
        $memcache->addServer($host,$port,$flag);
        //开启大值自动压缩,第一个参数表示处理数据大小的临界点，第二个参数表示压缩的比例，默认为0.2
        $memcache->setCompressThreshold(2000,0.2);
        $this->memcacheList[$host.$port] = $memcache;
        return $memcache;
     }
 }

Then implement a method class that contains common memcache methods such as add, set, get, flush, delete, etc., here named dlufmemcache

class dlufMemcache{
     private $memcache = null;
     function __construct($host,$port){

       $this->memcache = memcachepool::getInstance()->getMemcache($host,$port,true);
     }
    /**
     * memcache set value
     * @param [type]  $key 键
     * @param [type]  $value 值
     * @param integer $expire  到期的时间,如果此值设置为0表明此数据永不过期
     * @param integer $flag 标志位 使用MEMCACHE_COMPRESSED指定对值进行压缩(使用zlib)
     * @param [type]  $serializetype
     */
     public function set($key,$value,$expire=0,$flag=0,$serializetype=null){
        if($serializetype == 'json' && is_array($value)){
            $value = json_encode($value);
        }
         $this->memcache->set($key,$value,$flag,$expire);
     }
    /**
     * 从服务端查找元素
     * @param  [type] $key
     * @return [type]
     */
     public function get($key){
         return $this->memcache->get($key);
     }
    /**
     * 增加一个条目到缓存服务器
     * @param [type]  $key
     * @param [type]  $value
     * @param integer $expire
     * @param integer $flag
     * @param [type]  $serializetype
     */
    public function add($key,$value,$expire=0,$flag=0,$serializetype=null){
        if($serializetype == 'json' && is_array($value)){
            $value = json_encode($value);
        }
        $ret = $this->memcache->add($key,$value,$flag,$expire);
        return $ret;
    }
    /**
     * 清洗（删除）已经存储的所有的元素
     * @return [type]
     */
    public function flush(){
        return $this->memcache->flush();
    }
    /**
     *  从服务端删除一个元素
     * @param  [type] delete 参数：key要删除的元素的key 删除该元素的执行时间 timeout如果值为0,则该元素立即删除。
     * @return [type]
     */
    public function delete($key){
        $ret = $this->memcache->delete($key,0);
        return $ret;
    }
 }

Then call dlufmemcache:

1 $memcache = new dlufMemcache('127.0.0.1',11211);
2  $memcache->set('memcache','come on dluf&baidu !!!!!!');
3  $ret = $memcache->get('memcache');
4  echo print_r($ret,true);

The running output is visible:

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