friendica-directory/src/templates/widget/populartags.phtml

<div>
    <h3><?php echo $this->__('Popular Tags')?></h3>
    <ul>
		<?php foreach ($tags as $tag): ?>
            <li>
                <a href="<?php echo $this->escapeHtmlAttr($this->r('search', [], ['q' => $tag['term']])) ?>">
					<?php echo $this->e($tag['term']) ?>
                </a>
            </li>
		<?php endforeach; ?>
    </ul>
</div>