当查看包含密钥的帖子时，我试图保存帖子元userid:x 这个信息让我知道当前用户是否读过这篇文章（之后在侧栏中发出通知）。

我通过在single.php 紧接着the_content();:

<?php if ( in_category( \'oznamy\' )) { 

    $current_user = wp_get_current_user();
    $currentuserid = $current_user->ID;
    $towrite = "userid:";
    $meta_key = $towrite . $currentuserid;

    $meta_value = $post->ID ;
    add_post_meta($post->ID , $meta_key, $meta_value, true); 

} ?>

将meta值设置为post ID只是为了检查它保存到不同post的内容。它保存不同帖子的ID，但该帖子不会显示在single.php 环

因此，如果我查看前端的post 676，它会保存元键userid:1 和价值676, 这就是我想要的。然而，它也为key保存了metauserid:1 和价值674 对于post ID674 未显示。

为什么会single.php 甚至触摸不同的ID？

更新：整单。php代码如下：

<?php get_header(); ?>

<?php get_template_part(\'template-part\', \'head\'); ?>

<?php get_template_part(\'template-part\', \'topnav\'); ?>

<!-- start content container -->
<div class="row dmbs-content">

    <?php //left sidebar ?>
    <?php get_sidebar( \'left\' ); ?>

    <div class="col-md-<?php devdmbootstrap3_main_content_width(); ?> dmbs-main">

        <?php

            //if this was a search we display a page header with the results count. If there were no results we display the search form.
            if (is_search()) :

                 $total_results = $wp_query->found_posts;

                 echo "<h2 class=\'page-header\'>" . sprintf( __(\'%s Search Results for "%s"\',\'devdmbootstrap3\'),  $total_results, get_search_query() ) . "</h2>";

                 if ($total_results == 0) :
                     get_search_form(true);
                 endif;

            endif;

        ?>


<?php
    global $current_user;
    get_currentuserinfo();

?>


<?php if( is_user_member_of_blog( $current_user->ID ) ): ?>

<?php if( is_user_logged_in() ): ?>
<script>
$("#menu-item-508").addClass("active");
</script>



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

                    // single post
                    if ( is_single() ) : ?>

                        <div <?php post_class(); ?>>

                            <h2 class="page-header-single"><?php the_title() ;?></h2>
                            <?php if ( has_post_thumbnail() ) : ?>
                                <?php the_post_thumbnail(); ?>
                                <div class="clear"></div>
                            <?php endif; ?>

                            <?php the_content(); ?>


<!-- zapis id usera ktory precital oznam -->
<?php if ( in_category( \'oznamy\' )) { 


  $current_user = wp_get_current_user();
  $currentuserid = $current_user->ID;
  $towrite = "userid:";
  $meta_key = $towrite . $currentuserid;




$meta_value = $post->ID ;
add_post_meta($meta_value , $meta_key, $meta_value, true); 


} ?>

<!-- koniec zapis id usera ktory precital oznam -->



                            <?php wp_link_pages(); ?>
                            <?php get_template_part(\'template-part\', \'postmeta\'); ?>

Komentáre:
                            <?php comments_template(); ?>

                        </div>
                    <?php
                    // list of posts
                    else : ?>
                       <div <?php post_class(); ?>>

                            <h2 class="page-header">
                                <a href="<?php the_permalink(); ?>" title="<?php echo esc_attr( sprintf( __( \'Permalink to %s\', \'devdmbootstrap3\' ), the_title_attribute( \'echo=0\' ) ) ); ?>" rel="bookmark"><?php the_title(); ?></a>
                            </h2>

                            <?php if ( has_post_thumbnail() ) : ?>
                               <?php the_post_thumbnail(); ?>
                                <div class="clear"></div>
                            <?php endif; ?>
                            <?php the_content(); ?>
                            <?php wp_link_pages(); ?>
                            <?php get_template_part(\'template-part\', \'postmeta\'); ?>
                            <?php  if ( comments_open() ) : ?>
                                   <div class="clear"></div>
                                  <p class="text-right">
                                      <a class="btn btn-success" href="<?php the_permalink(); ?>#comments"><?php comments_number(__(\'Leave a Comment\',\'devdmbootstrap3\'), __(\'One Comment\',\'devdmbootstrap3\'), \'%\' . __(\' Comments\',\'devdmbootstrap3\') );?> <span class="glyphicon glyphicon-comment"></span></a>
                                  </p>
                            <?php endif; ?>
                       </div>

                     <?php  endif; ?>

                <?php endwhile; ?>
                <?php posts_nav_link(); ?>
                <?php else: ?>

                    <?php get_404_template(); ?>

            <?php endif; ?>
<?php else:
  wp_die(\'Unauthorized.\');
endif; ?>

<?php else:
  wp_die(\'Unauthorized.\');
endif; ?>
   </div>

   <?php //get the right sidebar ?>
   <?php get_sidebar( \'right\' ); ?>

</div>
<!-- end content container -->

<?php get_footer(); ?>