code: function addClass($className) {
  		if (!is_array($className)) {
  			$className = array($className);
  		}
  		$class = $this->class;
  		foreach ($className as $c) {
  			if (!(preg_match('`\b'.preg_quote($c).'\b`si', $class) > 0)) {
  				$class .= ' '.$c;
  			}
  		}
  		 $this->class = trim($class);
  	}
docs: Add new class(es)
  @param string|array $className