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wordpress开发教程：获取当前文章的前几篇以及后几篇文章

聚码源码网 wordpress教程

2022-02-25 0 166 百度已收录

previous_posts_link()与next_post_lnik()这两个函数公式坚信诸位wordpress主题风格开发人员一定不生疏，这两个函数公式是wordpress用于读取当今文章内容的前一篇及其后一篇文章的。可是有一些情况下大家为了更好地提升网址PV提升客户体验想多读取2~3篇文章内容，例如读取当今文章内容的前三篇文章及其后三篇文章内容那该怎么读取呢？查询了下wordpress的官方网文本文档，显而易见沒有现有的编码解析函数可以用。那麼只能亲自动手衣食无忧了。下列编码参照自wordpress默认设置函数公式get_adjacent_post函数改动而成：

function ztmao_get_post( $previous = true, $number = 1 ) {
//global当今文章内容自变量 $post 和数据库操作类wpdb
global $post, $wpdb;
if ( emptyempty( $post ) )
return null;
$current_post_date = $post->post_date;//当今文章内容的時间
$join = ”;
$posts_in_ex_cats_sql = ”;
//添加表
$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”;
//获得当今文章内容隶属归类,可以同为好几个归类,如果是自定的分析法,将category换为相匹配的分析法就可以
$cat_array = wp_get_object_terms($post->ID, ‘level’, array(‘fields’ => ‘ids’));
$join .= ” AND tt.taxonomy = ‘level’ AND tt.term_id IN (“ . implode(‘,’, $cat_array) . “)”;
//分辨时间是超过或是低于
$op = $previous ? ‘<‘ : ‘>’;
//排列
$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;
}

将该函数公式放到主题风格的functions.php文件中就可以，读取该函数公式的过程中会回到一个二维数组，应用实例：

<h4>这篇实例教程以前的2~3篇实例教程是</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>这篇实例教程以后的2~3篇实例教程是</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>