Renders flashMessenger's messages using Semantic UI markup

SemanticMessengerHelper.php

<?php
namespace Application\Helper;

use Zend\View\Helper\AbstractHelper;
use Zend\View\Helper\FlashMessenger;

/**
 * SemanticMessengerHelper class
 *
 * Register as plugin helper in application config:
 * 'view_helpers' => array(
 * 'invokables' => array(
 * 'messenger' => 'YourModule\Helper\SemanticMessengerHelper'
 * ),
 * )
 *
 * Display messages in a view:
 * <?= $this->messenger($this->flashMessenger(), 'success') ?>
 */
class SemanticMessengerHelper extends AbstractHelper
{
    /**
     * @param FlashMessenger $helper
     * @param $class
     * @param string $title
     * @return string
     */
    public function __invoke(FlashMessenger $helper, $class, $title='')
    {
        $messenger=$helper->getPluginFlashMessenger();
        $method=sprintf('%sMessages', ucfirst($class));

        if ($messenger->{'has' . $method}()) {
            return $this->renderMessages($messenger->{'get' . $method}(), $class, $title);
        }

        return '';
    }

    /**
     * @param array $messages
     * @param string $title
     * @param string $class
     * @return string
     */
    protected function renderMessages(array $messages, $class, $title)
    {
        $list=array();
        foreach ($messages as $message) {
            $list[] = '<li>' . $message . '</li>';
        }

        $title=$title == '' ?: sprintf('<div class="header">%s</div>', $title);
        return sprintf(
            '<script>$(".message .close").on("click", function() {$(this).closest(".message").fadeOut();});</script>'.
            '<div class="ui %s message"><i class="close icon"></i>%s<ul class="list">%s</ul></div>',
            $class, $title, implode('', $list)
        );
    }
}