给你，皮特，希望这是；“大团圆结局”；你在想。。。哈哈！

我们要做的第一件事是A）将登录用户的ID记录为post元数据，B）生成一个模板标记，我们可以使用它在某处显示该数据。

第二，我们想把模板标签放到你的单子里。php或显示单条帖子内容的模板部分。

我在整个代码中都做了完整的注释，这样您就可以看到我做了什么，也就不必在这里把它分解成块了。如果你能在一个地方看到整个街区，那就更容易了。

下面的代码是为包含在主题/子主题中而编写的functions.php 文件，但如果您愿意，可以轻松地将其转换为插件。

<?php
// First we run a function in the wp_head or wp_footer where we capture the ID of logged in users and save them to an array in postmeta.
function track_Petes_viewers() {
    //If the viewer isn\'t logged in, the rest is pointless, so we check this first.
    if( is_user_logged_in() ) :
        global $post;
        //Lets set a nonce.
        $viewers_nonce  = wp_create_nonce( \'viewers_nonce_\' . $post->ID );
        //Get the current user\'s ID.
        $userID         = get_current_user_id();
        //Lets check if this post already has a list of viewers so we can add to it.
        $viewers        = get_post_meta( $post->ID, \'petes_viewers\', true );  
        //If this post doesn\'t already have this meta, lets set up an empty array.
        if( empty( $viewers ) ) :
            $viewers = array();
        endif;
        //Now we add the current user\'s ID to the array.
        $viewers[]      = $userID;
        //We don\'t want users being recorded twice, we just need to know if they viewed it, not how may times
        //So we\'re going to run array_unique() to make sure each ID is only in there once.
        $viewers_list   = array_unique( $viewers );
        //We verify the nonce and if it works, we update_post_meta(), if not, we kill the process.
        if( !wp_verify_nonce( $viewers_nonce, \'viewers_nonce_\' . $post->ID ) ) :
            die();
        else :
            //If the postmeta doesn\'t exist, update_post_meta will create it, so we don\'t need to also use add_post_meta
            update_post_meta( $post->ID, \'petes_viewers\', $viewers_list );
        endif;
    endif;
}
//We\'re going to drop it in the wp_head, but you can change this to a different hook
add_action( \'wp_head\', \'track_Petes_viewers\' );

//Now we generate a template tag that we can drop into our single view of posts, wherever you like, to display a list of viewers
function display_Petes_viewers() {
    global $post;
    //Not sure what you\'re using this for, but let\'s ONLY show this on posts
    if( get_post_type( $post->ID ) == \'post\' ) :
        //We get the post meta for viewers
        $viewers_list   = get_post_meta( $post->ID, \'petes_viewers\', true );
        //If there is a record in the DB for this particular post, we\'ll cycle through the IDs and spit out names
        if( !empty( $viewers_list ) ) :
            //Let\'s wrap the whole thing in a <ul>
            echo \'<ul id="petes_viewers">\';
            foreach( $viewers_list as $viewer ) :
                //We user the ID numbers to get the User object
                $viewer_info    = get_userdata( (int)$viewer );
                //ADDED: Let\'s check if the user still exists.
                if( $viewer_info != false ) :
                    //We pull the display_name from the User object
                    //You can pull additional info using this pattern, like the email, the link to their profile, their first/lastname, etc.
                    $viewer_name    = $viewer_info->display_name;
                    //and now we echo out whatever data we pulled from the user object, format this however you like
                    echo \'<li>\' . $viewer_name . \'</li>\';
                endif; 
            endforeach;
            echo \'</ul><!--#petes_viewers-->\';
        endif;
    endif;
}
?>

您现在有了一个功能，可以在登录用户查看帖子时记录他们的ID。然后还有第二个函数，用于检查此元数据是否存在，如果存在，它将生成一个项目符号列表，列出查看过该特定帖子的用户的显示名称。

要使用第二个函数，只需将以下代码放入所需的主题模板中，即single。php。

<?php display_Petes_viewers(); ?>

现在，有很多事情可以改进。。。比如，我们是否向公众展示了查看该帖子的人员列表？还是只向其他登录用户显示？还是只向管理员或编辑显示？

第二，当我第一次登录并查看帖子时，我的显示名不会显示出来（不是第一次），我们是否想让所有人都喜欢并将当前用户添加到列表中not 已经开始了？

但这些都是相对简单的修改。

希望这有帮助，如果有帮助，请记住接受答案。：-）