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获取当前文章同分类下的前几篇文章和后几篇文章

代码是参考wp自带的get_adjacent_post函数修改而来,get_adjacent_post函数是wordpress用来获取上一篇和下一篇文章的基本函数。

函数作用:获取当前文章同分类下的前几篇文章和后几篇文章

参数:$previous为true时获取之前的文章,为false的时候获取之后的文章

$number为获取文章数量

函数代码:

//author:ashuwp
function ashu_get_adjacent_posts( $previous = true, $number = 1 ) {   
  
    //global当前文章变量 $post 和数据库操作类wpdb   
    global $post, $wpdb;   
    if ( empty( $post ) )   
        return null;   
  
    $current_post_date = $post->post_date;//当前文章的时间   
  
    $join = '';   
    $posts_in_ex_cats_sql = '';   
    //加入表   
    $join = " INNER JOIN $wpdb->term_relationships AS tr ON p.ID = tr.object_id INNER JOIN $wpdb->term_taxonomy tt ON tr.term_taxonomy_id = tt.term_taxonomy_id";   
    //获取当前文章所属分类,可以同属多个分类,如果是自定义的分类法,将category换成对应的分类法即可   
    $cat_array = wp_get_object_terms($post->ID, 'level', array('fields' => 'ids'));   
    $join .= " AND tt.taxonomy = 'level' AND tt.term_id IN (" . implode(',', $cat_array) . ")";   
  
    //判断时间是大于还是小雨   
    $op = $previous ? '<' : '>';   
    //排序   
    $order = $previous ? 'DESC' : 'ASC';   
       
    $where = $wpdb->prepare("WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' ", $current_post_date, $post->post_type);   
    $sort  = "ORDER BY p.post_date $order LIMIT 0, $number";   
  
    $query = "SELECT p.* FROM $wpdb->posts AS p $join $where $sort";   
    $query_key = 'adjacent_post_' . md5($query);   
    $result = wp_cache_get($query_key, 'counts');   
    if ( false !== $result )   
        return $result;   
  
    $result = $wpdb->get_results("SELECT p.* FROM $wpdb->posts AS p $join $where $sort");   
    if ( null === $result )   
        $result = '';   
    wp_cache_set($query_key, $result, 'counts');   
    return $result;   
}

将该函数放在主题的functions.php文件中即可,调用该函数的时候会返回一个数组,使用示例:

<h4>本篇教程之前的几篇教程是</h4>   
            <ul>   
            <?php   
            $preposts = ashu_get_adjacent_posts(true,3);   
            foreach( $preposts as $postt ){   
                echo '<li><a href="'.get_permalink($postt->ID).'" title="'.$postt->post_title .'">'.$postt->post_title .'</a></li>';   
            };   
            ?>   
            </ul>   
            <h4>本篇教程之后的几篇教程是</h4>   
            <ul>   
            <?php   
            $nextposts = ashu_get_adjacent_posts(false,3);   
            foreach( $nextposts as $postt ){   
                echo '<li><a href="'.get_permalink($postt->ID).'" title="'.$postt->post_title .'">'.$postt->post_title .'</a></li>';   
            };   
            ?>   
            </ul>

 

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