WordPress代码实现历史上的今天功能

本文介绍的“历史上的今天”并非显示历史上的今天发生国家以及朝代的大事，而是针对于自己的网站，在去年的今天你发不步过的文章内容的一个展示，所以使用本功能非常适合老站互动，至少也得一年吧，下面说下代码有需要安装的站长可以尝试安装代码

// 历史上的今天 
// https://www.waizhuti.com/2705.html
    function wp_today(){
        global $wpdb;
        $post_year = get_the_time('Y');
        $post_month = get_the_time('m');
        $post_day = get_the_time('j');
        $sql = "select ID, year(post_date_gmt) as h_year, post_title, comment_count FROM 
                $wpdb->posts WHERE post_password = '' AND post_type = 'post' AND post_status = 'publish'
                AND year(post_date_gmt)!='$post_year' AND month(post_date_gmt)='$post_month' AND day(post_date_gmt)='$post_day'
                order by post_date_gmt DESC limit 5";
        $histtory_post = $wpdb->get_results($sql);
        if( $histtory_post ){
            foreach( $histtory_post as $post ){
                $h_year = $post->h_year;
                $h_post_title = $post->post_title;
                $h_permalink = get_permalink( $post->ID );
                $h_comments = $post->comment_count;
                $h_post .= "<li><strong>$h_year:</strong>&nbsp;&nbsp;<a href='".$h_permalink."' title='".$h_post_title."' target='_blank'>$h_post_title($h_comments)</a></li>";
            }
        }
        if ( $h_post ){
            $result = "<h2>历史上的今天:</h2><ul>".$h_post."</ul>";
        }
        return $result;
    }
    function wp_today_auto($content){
        if( is_single() ){
            $content = $content.wp_today();
        }
        return $content;
    }
    add_filter('the_content', 'wp_today_auto',9999);

添加上述代码，默认将“历史上的今天”加载文章结尾处，如果你想改变位置去下下面代码部分

function wp_today_auto($content){
        if( is_single() ){
            $content = $content.wp_today();
        }
        return $content;
    }
    add_filter('the_content', 'wp_today_auto',9999);

调用

<?php echo wp_today(); ?>

即可