@Xroad，这是最简单的方法。根据具体情况，事情可能会变得更加复杂，但这是最简单的方法：

$query = get_posts(array(\'post_type\' => \'lexique\',\'posts_per_page\' => -1));

$by_letter = array();
while( $query->have_posts() ) { $query->the_post();
  global $post;
  $letter = substr($post->post_name, 0, 1);
  if ( ! isset($by_letter[$letter]) ) $by_letter[$letter] = array();
  $by_letter[$letter][] = $post;
}

$context = Timber::get_context();
$context[\'posts_by_letter\'] = $by_letter;
Timber::render(\'lexique.twig\', $context);

lexique.twig

{% for letter in posts_by_letter %}
  {% for post in letter %}
    <li><a href="{{ post.link }}">{{ post.title }}</a></li>
  {% endfor %}
{% endfor %}