您好@Aaron您可以使用简单的MySQL查询和CHAR\\u LENGTH（）函数；）

挂钩posts_orderby 只需自定义“交叉”帖子类型的默认前端查询，过滤器将是在不保存任何元字段的情况下实现所需结果的最快方法。但是，请注意，这实际上会修改所有前端查询，

add_filter(\'posts_orderby\', \'modify_crosses_query\', 10, 2);
function modify_crosses_query($orderby_statement, $wp_query){
  if(is_admin()){ //admin queries.
    return $orderby_statement;
  }
  global $wpdb;
  // Verify correct post type, or any other query variable
  if ($wp_query->get("post_type") === "crosses") {
    $orderby_statement = \'ORDER BY CHAR_LENGTH(\'.$wpdb->posts.\'.post_title) ASC\';
  }
}

您可以尝试此代码。我认为这是最好的分类方法。实际上，在foreach中使用$posts数组之前，需要对其进行排序。

$args = array(
    \'post_type\' => \'crosses\', // Only get the posts
    \'post_status\' => \'publish\', // Only the posts that are published
    \'posts_per_page\'   => -1 // Get every post
);
$posts = get_posts($args);

//This funtion is for sorting the array, depends on post\'s title length
function post_title_length_sort($a, $b){
    return strlen($a->post_title)-strlen($b->post_title);
}
usort($posts, \'post_title_length_sort\');

//You cam check your array now
//Now $posts is sorted by function "post_title_length_sort"
//and you can use the $posts array in a foreach

//print_r($posts);  for checking the array

foreach ( $posts as $post ) {

    //Your code goes here...
}

钩住save_post 只适用于新职位。它不会解决现有员额的问题。这只能用钩子解决init 甚至更好admin_init 并在选项表中标记它，以防止它在每个后续请求上执行。

此外，对于新职位来说，更有效的方法是save_post_{$post_type},

//for existing posts...
add_action(\'admin_init\', \'udpate_crosses_once`);
function udpate_crosses_once(){
  $flag = get_option(\'crosses_updated\', \'no\');
  if(\'no\'===$flag){
    $args = array(
      \'post_type\' => \'crosses\', 
      \'post_status\' => \'publish\', 
      \'posts_per_page\'   => -1 
    );
    $posts = get_posts($args);
    foreach ( $posts as $post ) {
      $length = strlen( trim( $post->post_title ) );
      update_post_meta( $post->ID, \'name_length_crosses\', $length );
    }
    add_option(\'crosses_updated\', \'yes\'); //set flag.
  }
}
//for new posts...
add_action( \'save_post_crosses\', \'save_crosses_title_length\', 10, 2 );
function save_crosses_title_length( $post_id, $post) {
  // Check to see if we are autosaving
  if (defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE){
    return;
  }
  $length = strlen( trim($post->post_title) );// get the length of title
  //udpate the meta field, in case the post title is being updated
  update_post_meta( $post_id, \'name_length_crosses\', $length );
  //note, no need to add_post_meta, udpate_post_meta fn will add the field if not found.
}

$crossposts = get_posts(array(
    \'post_type\' => \'crosses\',
    \'meta_key\'  => \'name_length_crosses\',
    \'orderby\'   => \'meta_value_num\',
    \'order\'     => \'ASC\'
));
if ( $crossposts ) {
    foreach ( $crossposts as $post ) :
        setup_postdata( $crossposts ); ?>
        <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
        <?php the_content(); ?>
    <?php
    endforeach; 
    wp_reset_postdata(); //Important, reset the query post data.
}