original_string: public function keyword($keyword)
      {
          $list = $this->keywordList($keyword);
          if (empty($list)) {
              throw new RuntimeException(sprintf('Keyword "%s" does not exist.', $keyword));
          }
  
          return $list[0];
      }
code: public function keyword($keyword)
      {
          $list = $this->keywordList($keyword);
          if (empty($list)) {
              throw new RuntimeException(sprintf('Keyword "%s" does not exist.', $keyword));
          }
  
          return $list[0];
      }
code_tokens: public function keyword ( $ keyword ) { $ list = $ this -> keywordList ( $ keyword ) ; if ( empty ( $ list ) ) { throw new RuntimeException ( sprintf ( 'Keyword "%s" does not exist.' , $ keyword ) ) ; } return $ list [ 0 ] ; }
docstring: Returns the first keyword with a given name.
  
  @param string $keyword
  
  @return object
docstring_tokens: Returns the first keyword with a given name .