Blog roll. Show all post by default, to filter by tag and show archive per year. The blog is structured “…/blog/year/post”; hence the […]->children()->children()

Kirby CMS blog; get all posts

<?php 

if(param('tag')) {
  // all tags are linked “…/weblog/tag:example”
  $posts = $page
    ->children()
    ->children()
    ->visible()
    ->filterBy('tags', urldecode(param('tag')), ',')
    ->flip();
  } else {
    // if no tag, list all based on “…/weblog/year/article”
    $posts = $page
      ->children()
      ->children()
      ->visible()
      ->flip();
    if($posts->count()==0) {
      // if someone happens to go to “…/weblog/year” this is fallback
      $posts = $page
      ->children()
      ->visible()
      ->flip();	
    }
  } 

?>

Kirby CMS blog; loop all posts

<?php if($posts->count()!=0): ?>
  <?php foreach($posts AS $p): ?>
    …
  <?php endforeach ?>
<?php else: ?>
  <p>Dude, I'm not using that tag on anything. Or am I? I might, I'm so confused&hellip;</p>
<?php endif ?>