original_string: public function cache($key, $value, $expire = null)
      {
          $this->_caches[$key] = $value;
          return true;
      }
code: public function cache($key, $value, $expire = null)
      {
          $this->_caches[$key] = $value;
          return true;
      }
code_tokens: public function cache ( $ key , $ value , $ expire = null ) { $ this -> _caches [ $ key ] = $ value ; return true ; }
docstring: expire not supported.
  
  {@inheritdoc}
docstring_tokens: expire not supported .