bnomei/kirby3-htmlhead

<?php if(isset($urls)): foreach($urls as $url): ?>
<link rel="alternate" hreflang="<?= is_array($url) ? A::get($url, 'lang') : '' ?>" href="<?= is_array($url) ? A::get($url, 'url') : $url ?>">
<?php endforeach; endif;