我会使用wp\\u查询。

将此放在您的函数中。php：

/**
 * Order posts by the last word in the post_title.
 * Activated when orderby is \'wpse_last_word\'
 */
add_filter(\'posts_orderby\', function($orderby_sql, \\WP_Query $q) {
  $orderbys = $q->get(\'orderby\');
  if (!$orderbys) {
    return;
  }
  if ($orderby_sql) {
    $orderby_sql_array = [$orderby_sql];
  }
  else {
    $orderby_sql_array = [];
  }
  if (!is_array($orderbys)) {
    $words = explode(\' \', $orderbys);
    $orderbys = [];
    foreach ($words as $word) {
      $orderbys[$word] = $q->get(\'order\');
    }
  }
  global $wpdb;
  foreach ($orderbys as $orderby => $direction) {
    if ($orderby == \'wpse_last_word\') {
      if (!$direction || !in_array(strtoupper($direction), [\'ASC\', \'DESC\'])) {
        $direction = \'DESC\';
      }
      $orderby_sql_array[] = "SUBSTRING_INDEX({$wpdb->posts}.post_title, \' \', -1) $direction";
    }
  }
  return implode(\', \', $orderby_sql_array);
}, 100, 2);

现在，您可以在类别3中执行此操作。php（未测试）：

<?php query_posts($query_string . \'&orderby=wpse_last_word&order=ASC\');?>

        <?php 
                if ( have_posts() ) : while ( have_posts() ) : the_post();

                    get_template_part( \'content-clients\', get_post_format() );

                endwhile; 

                 endif; ?>

但您肯定可以使用wp\\u查询并将其用作参数：（如果需要，添加其他参数）

$args = [
    \'posts_per_page\'   => 10,
    \'post_type\'        => \'post\',
    \'orderby\'          => \'wpse_last_word\',
    \'order\'            => \'ASC\'
];

$the_query = new WP_Query( $args );