original_string: public function addStylesheet($url)
      {
          $url = self::resolveUrl($url);
          if ($url) {
              $this->stylesheets[self::hashResource($url)] = $url;
          }
      }
code: public function addStylesheet($url)
      {
          $url = self::resolveUrl($url);
          if ($url) {
              $this->stylesheets[self::hashResource($url)] = $url;
          }
      }
code_tokens: public function addStylesheet ( $ url ) { $ url = self :: resolveUrl ( $ url ) ; if ( $ url ) { $ this -> stylesheets [ self :: hashResource ( $ url ) ] = $ url ; } }
docstring: Add a CSS stylesheet
  
  @param string $url CSS stylesheet URL
docstring_tokens: Add a CSS stylesheet