redis取多个数据 redis一次取多个key

public function mget(array $keys) {
   if (MEMCACHE_FLAG == 2) {
      return null;
   }
   if (! $this->connect) {
      $this->connect ();
   }
   $ret = parent::mget ( $keys );
   $res = array ();
   $i = 0;
   
   foreach ( $keys as $key ) {
      
      if (! isset ( $ret [$i] )) {
         $res [$key] = false;
      } else {
         $res [$key] = $ret [$i];
      }
      $i ++;
   }
   return $res;
}