original_string: public function set($key, $value, $duration = 0)
      {
          return $this->engine->set($this->_cachePrefix . $key, $value, $duration);
      }
code: public function set($key, $value, $duration = 0)
      {
          return $this->engine->set($this->_cachePrefix . $key, $value, $duration);
      }
code_tokens: public function set ( $ key , $ value , $ duration = 0 ) { return $ this -> engine -> set ( $ this -> _cachePrefix . $ key , $ value , $ duration ) ; }
docstring: Stores the value identified by the key into cache.
  @param string $key the key identifying the value to be cached.
  @param mixed $value the value to be cached
  @param int $duration the number of seconds in which the cached value will expire. 0 means never expire.
  @return bool
docstring_tokens: Stores the value identified by the key into cache .