Nearsoft\SeleniumClient\WebElement::addClass PHP Method

    public function addClass($class)
    {
        $script = sprintf("if(!arguments[0].className.match(/\\b{$class}\\b/))arguments[0].className+=' {$class}'");
        $this->_driver->executeScript($script, array(array('ELEMENT' => $this->_elementId)));
        return $this;
    }