PHP Operation Redis Caching method

<span style= "FONT-SIZE:12PX;" ><?php/** * Redis Cache operation * @author HXM * @version 1.0 * @since 2015.05.04/class Rcache extends Object implemen  TS Cacheface {private $redis = null;//redis Object Private $sId = 1;  Servier Service ID Private $con = null;//Link Resource/** * initialization Redis * * @return Object/Public function __construct () {if (!class_exists (' Redis ')) {throw new qexception (' PHP extension does not Exist:redis
    ');
  } $this->redis = new Redis ();  /** * Link MEMCAHCE service * @access private * @param string $key keyword * @param string $value Cached content *
    @return Array */Private Function Connect ($sid) {$file = $this->cachefile ();
    Require $file;
    if (! isset ($cache)) {throw new Qexception (' cache configuration file does not exist '. $file);
    } $server = $cache [$this->cacheid]; $sid = Isset ($sid) = = 0? $this->sid: $sid;//memcache Service Select if (! $server [$sid]) {throw new QException (' The cached server configuration file for the current operation does not exist ');
    $host = $server [$sid] [' Host '];
    $port = $server [$sid] [' Port '];
    try {$this->redis->connect ($host, $port);
    The catch (Exception $e) {exit (' Memecache connection failed, error message: '. $e->getmessage ()); }/** * Write cache * @access Private * @param string $key keyword * @param string $value cache content * @re Turn array */Public function set ($key, $value, $sid, $expire = 0) {$data = $this->get ($key, $sid);
    If there is already a key value if ($data) {return $this->redis->getset ($key, $value);
    else {return $this->redis->set ($key, $value); 
   }/** * Read cache * @access private * @param string $key keyword * @param int $sid Select the first few memcache servers
    * @return Array */Public function get ($key, $sid) {$this->connect ($SID);
  return $this->redis->get ($key); /** * Clean (delete) All elements that have been stored * * @access Private * @returN Array */Public function flush () {$this->connect ();
  return $this->redis->flushall (); /** * Delete Cache * * @access private * @param string $key keyword * @param int $sid Select the first few memcache servers * @re
    Turn array */Public function remove ($key, $sid) {$this->connect ();
  return $this->redis->del ($key); /** * destructor * finally closes memcache/public Function __destruct () {if ($this->redis) {$thi
    S->redis->close (); }}}</span>