php操作memcache缓存方法分享

<?php
/
  Memcache缓存操作
  @author hxm
  @version 1.0
  @since 2015.05.04
 /
class MCache extends Object implements CacheFace
{
  private $mem = null; //Mem对象
   
  private $sId = 1;  //servier服务ID
   
  /
    初始化Memcache
   
    @return Object
   /
  public function __construct()
  {
    if ( !class_exists('Memcache') )
    {
      throw new QException('PHP extension does not exist: Memcache');
    }
    $this->mem = new Memcache();
  }
   
  /
    链接memcahce服务
   
    @aess private
    @param  string $key 关键字
    @param  string $value 缓存内容
    @return array
   /
  private function connect( $sid )
  {
    $file = $this->CacheFile();
    require $file;
    if(! isset($cache) )
    {
      throw new QException('缓存配置文件不存在'.$file);
    }
    $server = $cache[$this->cacheId];
    $sid  = isset($sid) == 0 ? $this->sId : $sid;//memcache服务选择
    if ( ! $server[$sid])
    {
      throw new QException('当前操作的缓存服务器配置文件不存在');
    }
    $host = $server[$sid]['host'];
    $port = $server[$sid]['port'];
    try {
      $this->mem->connect( $host , $port );
    } catch (Exception $e) {
      exit('memecache连接失败，错误信息'. $e->getMessage());
    }
  }
   
  /
    写入缓存
   
    @aess private
    @param  string $key 关键字
    @param  string $value 缓存内容
    @return array
   /
  public function set( $key , $value , $sid , $expire = 0)
  {
    $data = $this->get($key , $sid); //如果已经存在key值
    if( $data ) 
    {
      return $this->mem->set( $key , $value ,MEMCACHE_COMPRESSED , $expire);
    } else {
      return $this->mem->add( $key , $value ,MEMCACHE_COMPRESSED , $expire);
    }
  }
   
  /
    读取缓存
   
    @aess private
    @param  string $key 关键字
    @param  int   $sid 选择第几台memcache服务器
    @return array
   /
  public function get( $key , $sid)
  {
    $this->connect( $sid );
    return $this->mem->get($key);
  }
   
  /
    清洗（删除）已经存储的所有的元素
   
    @aess private
    @return array
   /
  public function flush()
  {
    $this->connect();
    return $this->mem->flush();
  }
  /
    删除缓存
   
    @aess private
    @param  string $key 关键字
    @param  int   $sid 选择第几台memcache服务器
    @return array
   /
  public function remove( $key , $sid)
  {
    $this->connect();
    return $this->mem->delete($key);
  }
   
  /
    析构函数
    关闭memcache
   /
  public function __destruct()
  {
    /if(! $this->mem)
    {
      $this->mem->close();
    }/
  }
}