wordpress开发教程：获取当前文章的前几篇以及后几篇文章

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 ztmao_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 ( emptyempty( $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 = v7v3_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 = ztmao_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>