解决方法如下：
<?php
/*
Plugin Name: Auto Numbering Post
Plugin URI: https://dev.coziplace.com/free-wordpress-plugins/auto-numbering-post
Description: Automatically numbering all published posts based on the publish date and display the number in front of all published post titles.
Version: 1.2
Author: Narin Olankijanan
Author URI: https://dev.coziplace.com
License: GPLv2
*/
/* Copyright 2012 Narin Olankijanan (email: [email protected])
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc. 51 Franklin St, Fifth floor, Boston MA 02110-1301 USA
*/
add_action( 'the_title', 'dk_auto_numbering' );
function dk_auto_numbering($title) {
$post_ID = get_the_ID();
$the_post = get_post($post_ID);
$date = $the_post->post_date;
$maintitle = $the_post->post_title;
$count ='';
if ($the_post->post_status == 'publish' AND $the_post->post_type == 'post' AND in_the_loop()) {
global $wpdb;
$count = $wpdb->get_var("SELECT count(*) FROM $wpdb->posts WHERE post_status='publish' AND post_type='post' AND post_date<'{$date}'");
if ($maintitle==$title) {
$count = $count.': ';
} else {
$count ='';
}
}
return $count.$title;
}
/* EOF */
