之前大叔介绍过 wordpress相关文章实现的方法，例：《代码实现WordPress相关文章》，那么今天说的这个教程，是从优化角度来更合理的实现wordpress相关文章的，至于客观喜欢哪个，自己决定吧！
策略：文章内容相关程度： 手动指定 > 标签 >分类 > 随机
实现方式：下面代码直接加到functions.php中即可
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function add_related_posts($content){
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return $content . wp_related_posts();
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}
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add_filter (‘the_content’, ‘add_related_posts’); //hook
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function wp_related_posts(){
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global $post;
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$num = 5;//文章数量
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$counter = 1;
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$exclude_id = get_post_meta($post->ID,’related’,true);//获取手动置顶的相关文章
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if ($exclude_id){
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$args = array(
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‘post_status’ => ‘publish’,
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‘post_type’ => array(‘post’),
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‘post__in’ => explode(‘,’, $exclude_id),
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‘posts_per_page’ => $num
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);
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$posts = get_posts($args);
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foreach($posts as $sb){
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$output .= ‘<li><a href=”‘ . get_permalink($sb->ID) . ‘”>’ . $sb->post_title . ‘</a></li>’;//可自定义样式
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$i++;
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}
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}
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if( $i < $num){//自定义文章数不足后通过分类和标签处理
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$tagsid = array();
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$catid = array();
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$thisid[] = $post->ID;
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$posttags = get_the_tags();
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$catids = get_the_category();
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if(!emptyempty($posttags)) {
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foreach($posttags as $tag) {
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$tagsid[] = $tag->term_id;
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}
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}
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if(!emptyempty($catids)) {
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foreach($catids as $cat) {
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$catid[] = $cat->term_id;
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}
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}
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$args = array(
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‘post_type’ => ‘post’,
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‘post__not_in’ => $thisid,
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‘ignore_sticky_posts’ => 1,
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‘posts_per_page’ => ($num – $i),
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‘tax_query’ => array(
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‘relation’ => ‘OR’,//改成AND则必须是同标签同分类下
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array(
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‘taxonomy’ => ‘post_tag’,
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‘field’ => ‘term_id’,
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‘terms’ => $tagsid,
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),
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array(
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‘taxonomy’ => ‘category’,
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‘field’ => ‘term_id’,
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‘terms’ => $catid,
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),
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),
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);
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$rsp = get_posts($args );
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foreach($rsp as $sb){
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$output .= ‘<li><a href=”‘ . get_permalink($sb->ID) . ‘”>’ . $sb->post_title . ‘</a></li>’;//可自定义样式
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$i++;
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}
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}
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$final = ‘<h3>相关文章</h3><ul>’ . $output . ‘</ul>’;
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return $final;
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}
调用方法
如需加入自定义相关文章，只需新建自定义栏目，加入文章id即可，多篇文章用,隔开
如想自定位置，并调整样式，则去掉the_content的钩子，然后手动调用wp_related_posts函数
骚年，创作吧。。。。
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