如何为WordPress添加相关文章功能,并提供了标题列表样式和缩略图样式。相关文章的获取思路是:Tags标签相关>同分类下文章,也就是说,先获取标签相同的文章,如果还达不到数量,就调用该分类下的文章补足。获取方法貌似最初来自Willin Kan 大师,倡萌再次修改。

1.添加标题列表样式的相关文章
将下面的代码添加到 single.php 要显示相关文章的位置即可:
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- <h3>相关文章</h3>
- <ul class="related_posts">
- <?php
- $post_num = 8;
- $exclude_id = $post->ID;
- $posttags = get_the_tags(); $i = 0;
- if ( $posttags ) {
- $tags = ''; foreach ( $posttags as $tag ) $tags .= $tag->term_id . ',';
- $args = array(
- 'post_status' => 'publish',
- 'tag__in' => explode(',', $tags),
- 'post__not_in' => explode(',', $exclude_id),
- 'caller_get_posts' => 1,
- 'orderby' => 'comment_date',
- 'posts_per_page' => $post_num,
- );
- query_posts($args);
- while( have_posts() ) { the_post(); ?>
- <li><a rel="bookmark" href="<?php%20the_permalink();%20?>" title="<?php the_title(); ?>" target="_blank"><?php the_title(); ?></a></li>
- <?php
- $exclude_id .= ',' . $post->ID; $i ++;
- } wp_reset_query();
- }
- if ( $i < $post_num ) {
- $cats = ''; foreach ( get_the_category() as $cat ) $cats .= $cat->cat_ID . ',';
- $args = array(
- 'category__in' => explode(',', $cats),
- 'post__not_in' => explode(',', $exclude_id),
- 'caller_get_posts' => 1,
- 'orderby' => 'comment_date',
- 'posts_per_page' => $post_num - $i
- );
- query_posts($args);
- while( have_posts() ) { the_post(); ?>
- <li><a rel="bookmark" href="<?php%20the_permalink();%20?>" title="<?php the_title(); ?>" target="_blank"><?php the_title(); ?></a></li>
- <?php $i++;
- } wp_reset_query();
- }
- if ( $i == 0 ) echo '<li>没有相关文章!</li>';
- ?>
- </ul>
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PS:第四行$post_num = 8;表示显示8篇文章,请根据自己的需要修改。
显示样式需要自己写css,可以参考一下下面的:
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- .related_posts{margin-top:5px;}
- .related_posts li{margin-left:20px;color:#444;list-style:circle;font-size:14px;line-height:26px;padding:0 0 0 5px}
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2.添加含缩略图的相关文章

倡萌只是根据上面的代码改了一下,添加了缩略图。
1)在主题的 functions.php 的最后一个 ?> 前添加下面的代码:
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- //添加特色缩略图支持
- if ( function_exists('add_theme_support') )add_theme_support('post-thumbnails');
-
- //输出缩略图地址 From wpdaxue.com
- function post_thumbnail_src(){
- global $post;
- if( $values = get_post_custom_values("thumb") ) { //输出自定义域图片地址
- $values = get_post_custom_values("thumb");
- $post_thumbnail_src = $values [0];
- } elseif( has_post_thumbnail() ){ //如果有特色缩略图,则输出缩略图地址
- $thumbnail_src = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID),'full');
- $post_thumbnail_src = $thumbnail_src [0];
- } else {
- $post_thumbnail_src = '';
- ob_start();
- ob_end_clean();
- $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
- $post_thumbnail_src = $matches [1] [0]; //获取该图片 src
- if(empty($post_thumbnail_src)){ //如果日志中没有图片,则显示随机图片
- $random = mt_rand(1, 10);
- echo get_bloginfo('template_url');
- echo '/images/pic/'.$random.'.jpg';
- //如果日志中没有图片,则显示默认图片
- //echo '/images/default_thumb.jpg';
- }
- };
- echo $post_thumbnail_src;
- }
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PS:上面的代码主要是获取图片链接,获取的顺序是:
自定义字段为 thumb 的图片>特色缩略图>文章第一张图片>随机图片/默认图片;
随机图片:请制作10张图片,放在现用主题文件夹下的 images/pic/ 目录,图片为jpg格式,并且使用数字 1-10命名,比如 1.jpg;如果你不想用随机图片,请将 倒数第5行 前面的“//”去掉,然后给 倒数第7、9行 前面添加“//”注销,并且在现用主题的 /images/ 目录下添加一张名字为 default_thumb.jpg 的默认图片,这样,就会显示默认图片。
2)将下面的代码添加到 single.php 要显示相关文章的位置:
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- <h3>相关文章</h3>
- <ul class="related_img">
- <?php
- $post_num = 4;
- $exclude_id = $post->ID;
- $posttags = get_the_tags(); $i = 0;
- if ( $posttags ) {
- $tags = ''; foreach ( $posttags as $tag ) $tags .= $tag->term_id . ',';
- $args = array(
- 'post_status' => 'publish',
- 'tag__in' => explode(',', $tags),
- 'post__not_in' => explode(',', $exclude_id),
- 'caller_get_posts' => 1,
- 'orderby' => 'comment_date',
- 'posts_per_page' => $post_num
- );
- query_posts($args);
- while( have_posts() ) { the_post(); ?>
- <li class="related_box" >
- <div class="r_pic">
- <a href="<?php%20the_permalink();%20?>" title="<?php the_title(); ?>" target="_blank">
- <img src="<?php%20echo%20post_thumbnail_src();%20?>" alt="<?php the_title(); ?>" class="thumbnail" />
- </a>
- </div>
- <div class="r_title"><a href="<?php%20the_permalink();%20?>" title="<?php the_title(); ?>" target="_blank" rel="bookmark"><?php the_title(); ?></a></div>
- </li>
- <?php
- $exclude_id .= ',' . $post->ID; $i ++;
- } wp_reset_query();
- }
- if ( $i < $post_num ) {
- $cats = ''; foreach ( get_the_category() as $cat ) $cats .= $cat->cat_ID . ',';
- $args = array(
- 'category__in' => explode(',', $cats),
- 'post__not_in' => explode(',', $exclude_id),
- 'caller_get_posts' => 1,
- 'orderby' => 'comment_date',
- 'posts_per_page' => $post_num - $i
- );
- query_posts($args);
- while( have_posts() ) { the_post(); ?>
- <li class="related_box" >
- <div class="r_pic">
- <a href="<?php%20the_permalink();%20?>" title="<?php the_title(); ?>" target="_blank">
- <img src="<?php%20echo%20post_thumbnail_src();%20?>" alt="<?php the_title(); ?>" class="thumbnail" />
- </a>
- </div>
- <div class="r_title"><a href="<?php%20the_permalink();%20?>" title="<?php the_title(); ?>" target="_blank" rel="bookmark"><?php the_title(); ?></a></div>
- </li>
- <?php $i++;
- } wp_reset_query();
- }
- if ( $i == 0 ) echo '<div class="r_title">没有相关文章!</div>';
- ?>
- </ul>
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PS:第四行$post_num = 4; 表示调用4篇文章,请根据自己需要修改。
css样式自己写,也可参考一下:
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- .related_posts{margin-top:5px;}
- .related_img{width:600px;height:210px;}
- .related_box{float:left;overflow:hidden;margin-top:5px;width:148px;border-right:1px #eee solid}
- .related_box:hover{background:#f9f9f9}
- .related_box .r_title{width:auto;height:72px;font-weight:400;font-size:14px;margin:0 10px;overflow:hidden;}
- .related_box .r_pic{margin:6px}
- .related_box .r_pic img{width:130px;height:100px;border:1px solid #e1e1e1;background:#fff;padding:2px}
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