original_string: public function addExtraClasses($classes)
      {
          if (!is_array($classes)) {
              $classes = explode(" ", $classes);
          }
  
          $this->extra_classes = array_merge(
              $this->extra_classes,
              $classes
          );
  
          return $this;
      }
code: public function addExtraClasses($classes)
      {
          if (!is_array($classes)) {
              $classes = explode(" ", $classes);
          }
  
          $this->extra_classes = array_merge(
              $this->extra_classes,
              $classes
          );
  
          return $this;
      }
code_tokens: public function addExtraClasses ( $ classes ) { if ( ! is_array ( $ classes ) ) { $ classes = explode ( " " , $ classes ) ; } $ this -> extra_classes = array_merge ( $ this -> extra_classes , $ classes ) ; return $ this ; }
docstring: Add additional css classes
  
  @param  array|string  $extra_classes  extra CSS classes
  
  @return  self
docstring_tokens: Add additional css classes