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="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></p>
<?php
endwhile;
}
}
?>
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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 = '<ul>';
// 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) {
$retval .= '
<li><a title="'.wptexturize($r->post_title).'" href="'.get_permalink($r->ID).'">'.wptexturize($r->post_title).'</a></li>
';
}
} else {
$retval .= '
<li>No related posts found</li>
';
}
$retval .= '</ul>
';
return $retval;
}
return;
}
add_shortcode('related_posts', 'related_posts_shortcode');
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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。
[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 = '<h3>Recent Pages</h3>' ) {
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 .= '<ul>';
$args = array(
'numberposts' => $limit,
'category' => $category,
);
$recentposts = get_posts( $args );
foreach($recentposts as $post) {
setup_postdata($post);
$output .= '<li><a href="' . get_permalink($post->ID) . '">' . get_the_title($post->ID) . '</a></li>';
}
$output .= '</ul>';
return $output;
}
}
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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