实现WordPress文章页面的相关文章列表代码

网页制作Webjx文章简介：在single文章页使用相关文章功能的好处是显而易见的，可以增加网站的粘度的同时，更多地是更方便地为用户列出了他可能关心的内容。

在single文章页使用相关文章功能的好处是显而易见的，可以增加网站的粘度的同时，更多地是更方便地为用户列出了他可能关心的内容。一般情况下我们是使用水煮鱼的WordPress Related Posts插件来实现的，那么，在尽量节约插件的使用数量的前提下，我们还可以手动添加代码来实现。

1，相关文章非插件实现方法

<?php
//for use in the loop, list 5 post titles related to first tag on current post
$tags = wp_get_post_tags($post->ID);
if ($tags) {
 echo 'Related Posts';
 $first_tag = $tags[0]->term_id;
 $args=array(
 'tag__in' => array($first_tag),
 'post__not_in' => array($post->ID),
 'showposts'=>5,
 'caller_get_posts'=>1
 );
 $my_query = new WP_Query($args);
 if( $my_query->have_posts() ) {
 while ($my_query->have_posts()) : $my_query->the_post(); ?>
 <p><a href="" rel="bookmark" title="Permanent Link to "><?php the_title(); ?></a></p>
 <?php
 endwhile;
 }
}
?>

2,创建相关文章的发布短代码

把下面的代码写入到你的主题文件夹中的function.php中

function related_posts_shortcode( $atts ) {
 extract(shortcode_atts(array(
 'limit' => '5',
 ), $atts));

 global $wpdb, $post, $table_prefix;

 if ($post->ID) {
 $retval = ''; // Get tags $tags = wp_get_post_tags($post->ID); $tagsarray = array(); foreach ($tags as $tag) { $tagsarray[] = $tag->term_id; } $tagslist = implode(',', $tagsarray);  // Do the query $q = "SELECT p.*, count(tr.object_id) as count FROM $wpdb->term_taxonomy AS tt, $wpdb->term_relationships AS tr, $wpdb->posts AS p WHERE tt.taxonomy ='post_tag' AND tt.term_taxonomy_id = tr.term_taxonomy_id AND tr.object_id  = p.ID AND tt.term_id IN ($tagslist) AND p.ID != $post->ID AND p.post_status = 'publish' AND p.post_date_gmt < NOW() GROUP BY tr.object_id ORDER BY count DESC, p.post_date_gmt DESC LIMIT $limit;";  $related = $wpdb->get_results($q); if ( $related ) { foreach($related as $r) { $retval .= ' .wptexturize($r->post_title).'" href="'.get_permalink($r->ID).'">'.wptexturize($r->post_title).''; } } else { $retval .= ' No related posts found'; } $retval .= '
 // Get tags
 $tags = wp_get_post_tags($post->ID);
 $tagsarray = array();
 foreach ($tags as $tag) {
 $tagsarray[] = $tag->term_id;
 }
 $tagslist = implode(',', $tagsarray);

 // Do the query
 $q = "SELECT p.*, count(tr.object_id) as count
 FROM $wpdb->term_taxonomy AS tt, $wpdb->term_relationships AS tr, $wpdb->posts AS p WHERE tt.taxonomy ='post_tag' AND tt.term_taxonomy_id = tr.term_taxonomy_id AND tr.object_id  = p.ID AND tt.term_id IN ($tagslist) AND p.ID != $post->ID
 AND p.post_status = 'publish'
 AND p.post_date_gmt < NOW()
 GROUP BY tr.object_id
 ORDER BY count DESC, p.post_date_gmt DESC
 LIMIT $limit;";

 $related = $wpdb->get_results($q);
 if ( $related ) {
 foreach($related as $r) {
 $retval .= '

.wptexturize($r->post_title).'" href="'.get_permalink($r->ID).'">'.wptexturize($r->post_title).'
';
 }
 } else {
 $retval .= '

No related posts found
';
 }
 $retval .= '
';
 return $retval;
 }
 return;
}
add_shortcode('related_posts', 'related_posts_shortcode');

以后，你就可以在博客的任意位置插入下面的短代码，来实现相关文章的调用显示了。

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[related_posts]

3，同一分类下的相关文章

实现了相关文章的调用后，有的人又希望列出的文章和原文是同一分类下的，那么如何实现呢？

首先，同样把下面的代码写入的主题文件夹中的function.php中

/**
 * related post with category
 * @param: int $limit limit of posts
 * @param: bool $catName echo category name
 * @param: string $title string before all entries
 * Example: echo fb_cat_related_posts();
 */
if ( !function_exists('fb_get_cat_related_posts') ) {
 function fb_get_cat_related_posts( $limit = 5, $catName = TRUE, $title = 'Recent Pages' ) {

 if ( !is_single() )
 return;

 $limit = (int) $limit;
 $output  = '';
 $output .= $title;

 $category = get_the_category();
 $category = (int) $category[0]->cat_ID;

 if ( $catName )
 $output .= __( 'Kategorie: ' ) . get_cat_name($category) . ' ';

 $output .= '';  $args = array( 'numberposts' => $limit, 'category' => $category, );  $recentposts = get_posts( $args ); foreach($recentposts as $post) { setup_postdata($post); $output .= '. get_permalink($post->ID) . '">' . get_the_title($post->ID) . ''; }  $output .= '';

 $args = array(
 'numberposts' => $limit,
 'category' => $category,
 );

 $recentposts = get_posts( $args );
 foreach($recentposts as $post) {
 setup_postdata($post);
 $output .= '
. get_permalink($post->ID) . '">' . get_the_title($post->ID) . '
 }

 $output .= '

 return $output;
 }
}

之后，调用自定义的函数fb_get_cat_related_posts就可以了，该函数包括3个参数

• $limit (int) 定义显示文章数，int型数据；
• $catName (bool) 输出分类名称，bool型数据（ TRUE or FALSE）
• $title (string) String for a text before all entries