previous_posts_link()与next_post_lnik()这两个函数相信各位wordpress主题开发者一定不陌生,这两个函数是wordpress用来调用当前文章的前一篇以及后一篇文章的。但是有些时候我们为了提高网站PV提高用户体验想多调用几篇文章,例如调用当前文章的前三篇文章以及后三篇文章那该怎么调用呢?查看了下wordpress的官方文档,显然没有现成的代码和函数可用。那么只好自己动手丰衣足食了。以下代码参考自wordpress默认函数get_adjacent_post函数修改而来:


function ruikeedu_get_post( $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于  
    $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 = ruikeedu_get_post(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 = ruikeedu_get_post(false,3);  
            foreach( $nextposts as $postt ){  
                echo '<li><a href="'.get_permalink($postt->ID).'" title="'.$postt->post_title .'">'.$postt->post_title .'</a></li>';  
            };  
            ?>  
            </ul>