original_string: public function delete($key) {
          $used_key = $this->getUsedKey($key);
          return ($this->redis->delete($used_key) > 0);
      }
code: public function delete($key) {
          $used_key = $this->getUsedKey($key);
          return ($this->redis->delete($used_key) > 0);
      }
code_tokens: public function delete ( $ key ) { $ used_key = $ this -> getUsedKey ( $ key ) ; return ( $ this -> redis -> delete ( $ used_key ) > 0 ) ; }
docstring: delete a specific data in the cache
  @param string $key    key used for storing data in the cache
  @return boolean       false if failure
docstring_tokens: delete a specific data in the cache