Wordpress非插件显示相关日志源代码

方法一：单篇日志和 feed 中都可以生成相关日志

　　把以下代码复制到 Wordpress 的主题文件 functions.php 中：

function wp_get_related_posts()
{
global $wpdb, $post,$table_prefix;
$limit = 10; //显示几条相关文章
if(!$post->ID){return;}
$now = current_time('mysql', 1);
$tags = wp_get_post_tags($post->ID);
$taglist = "'" . $tags[0]->term_id. "'";
$tagcount = count($tags);
if ($tagcount > 1) {
    for ($i = 1; $i < $tagcount; $i++) {
        $taglist = $taglist . ", '" . $tags[$i]->term_id . "'";
    }
}
    $limitclause = "LIMIT $limit";
$q = "SELECT p.ID, p.post_title, p.post_date,  p.comment_count, count(t_r.object_id) as cnt FROM $wpdb->term_taxonomy t_t, $wpdb->term_relationships t_r, $wpdb->posts p WHERE t_t.taxonomy ='post_tag' AND t_t.term_taxonomy_id = t_r.term_taxonomy_id AND t_r.object_id  = p.ID AND (t_t.term_id IN ($taglist)) AND p.ID != $post->ID AND p.post_status = 'publish' AND p.post_date_gmt < '$now' GROUP BY t_r.object_id ORDER BY cnt DESC, p.post_date_gmt DESC $limitclause;";
$related_posts = $wpdb->get_results($q);
$output = "";
if (!$related_posts)
{
    $output  .= '<li>无相关日志</li>';
}
foreach ($related_posts as $related_post )
{
    $dateformat = get_option('date_format');
    $output .= '<li>';
    $output .=  '<a href="'.get_permalink($related_post->ID).'" title="'.wptexturize($related_post->post_title).' ('.mysql2date($dateformat, $related_post->post_date).')">'.wptexturize($related_post->post_title).'</a> ('. $related_post->comment_count .')';
    $output .=  '</li>';
}
$output = '<h3> 相关日志</h3><ul>' . $output . '</ul>';
return $output;
}
function wp_related_posts_attach($content)
{
      if (is_single()||is_feed())
      {
      $output = wp_get_related_posts();
      $content = $content . $output;
       }
return $content;
}
add_filter('the_content', 'wp_related_posts_attach',100);

方法二：仅在单篇日志中显示相关日志

　　在 Wordpress 主题文件 single.php 中需要的位置插入以下代码即可：

<h3>相关日志</h3>
<ul>
<?php
$tags = wp_get_post_tags($post->ID);
if ($tags) {
$first_tag = $tags[0]->term_id;
$args=array(
'tag__in' => array($first_tag),
'post__not_in' => array($post->ID),
'showposts'=>10,
'caller_get_posts'=>1
);
$my_query = new WP_Query($args);
if( $my_query->have_posts() ) {
while ($my_query->have_posts()) : $my_query->the_post(); ?>
<li><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title_attribute(); ?>"><?php the_title();?> <?php comments_number(' ','(1)','(%)'); ?></a></li>
<?php
endwhile;
}
}
wp_reset_query();
?>
</ul>