icingaweb2/application/views/scripts/layout/menu.phtml

<ul>
    <?php foreach ($items as $item): ?>
        <?php
        $itemClass = '';
        if ($sub) {
            // $itemClass .= 'submenu ';
        }
        if ($this->href($url) === $this->href($item->getUrl())) {
            $itemClass .= 'active ';
        }
        ?>
        <li <?php if (!empty($itemClass)): ?>class="<?= $itemClass ?>"<?php endif ?>>
            <?php if($item->getUrl()): ?>
                <a href="<?= $this->href($item->getUrl()); ?>" <?php foreach($item->getAttribs() as $attrib => $value): ?> <?= $attrib ?>="<?= $value ?>"<?php endforeach?>>
            <?php endif; ?>
            <?php
            if ($icon = $item->getIcon()) {
                echo $this->img($icon, array('height' => 16, 'width' => 16));
            }
            ?>
            <?php if ($iconClass = $item->getIconClass()): ?>
            <i class="<?= $iconClass ?>"></i>
            <?php endif ?>
            <?= $item->getTitle();?>
            <?php if($item->getUrl()): ?>
                </a>
            <?php endif; ?>
            <?php
            if($item->hasChildren()) {
                echo $this->partial(
                    'layout/menu.phtml',
                    'default',
                    array('items' => $item->getChildren(), 'sub' => true, 'url' => $this->url)
                );
            }
            ?>
        </li>
    <?php endforeach ?>
</ul>