WordPress调用最近更新过的文章

老文章重新编辑修改以后，怕读者不知道？那就来给网站添加最新修改过的文章列表吧，这样一来，只要你更新了老文章，读者就可以很快知道了。如果你建的是软件站、电影站等分享的内容，那就不需要一个版本就发布一篇文章啦！给你的网站添加这个功能吧！

方法来自 zwwooooo 大师的给老文章一个机会: Recently Updated Posts，都已经封装成函数了，加了2个参数：$num – 展示数量，$days – 几天内的新文章除外。还添加了数据库缓存方式，因为考虑到查询量，所以在你修改文章/删除文章/发表文章时才会更新缓存。

1. 把下面的函数代码扔到主题的 functions.php 的最后一个 ?> 的前面：

<span style="color: #666666; font-style: italic;">// Recently Updated Posts by zwwooooo | zww.me</span>
<span style="color: #000000; font-weight: bold;">function</span> recently_updated_posts<span style="color: #009900;">&#40;</span><span style="color: #000088;">$num</span><span style="color: #339933;">=</span><span style="color: #cc66cc;">10</span><span style="color: #339933;">,</span><span style="color: #000088;">$days</span><span style="color: #339933;">=</span><span style="color: #cc66cc;">7</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
   <span style="color: #b1b100;">if</span><span style="color: #009900;">&#40;</span> <span style="color: #339933;">!</span><span style="color: #000088;">$recently_updated_posts</span> <span style="color: #339933;">=</span> get_option<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'recently_updated_posts'</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
       query_posts<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'post_status=publish&amp;orderby=modified&amp;posts_per_page=-1'</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
       <span style="color: #000088;">$i</span><span style="color: #339933;">=</span><span style="color: #cc66cc;">0</span><span style="color: #339933;">;</span>
       <span style="color: #b1b100;">while</span> <span style="color: #009900;">&#40;</span> have_posts<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span> <span style="color: #339933;">&amp;&amp;</span> <span style="color: #000088;">$i</span><span style="color: #339933;">&lt;</span><span style="color: #000088;">$num</span> <span style="color: #009900;">&#41;</span> <span style="color: #339933;">:</span> the_post<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
           <span style="color: #b1b100;">if</span> <span style="color: #009900;">&#40;</span>current_time<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'timestamp'</span><span style="color: #009900;">&#41;</span> <span style="color: #339933;">-</span> get_the_time<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'U'</span><span style="color: #009900;">&#41;</span> <span style="color: #339933;">&gt;</span> <span style="color: #cc66cc;">60</span><span style="color: #339933;">*</span><span style="color: #cc66cc;">60</span><span style="color: #339933;">*</span><span style="color: #cc66cc;">24</span><span style="color: #339933;">*</span><span style="color: #000088;">$days</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
               <span style="color: #000088;">$i</span><span style="color: #339933;">++;</span>
               <span style="color: #000088;">$the_title_value</span><span style="color: #339933;">=</span>get_the_title<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
               <span style="color: #000088;">$recently_updated_posts</span><span style="color: #339933;">.=</span><span style="color: #0000ff;">'&lt;li&gt;&lt;a href=&quot;'</span><span style="color: #339933;">.</span>get_permalink<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">.</span><span style="color: #0000ff;">'&quot; title=&quot;'</span><span style="color: #339933;">.</span><span style="color: #000088;">$the_title_value</span><span style="color: #339933;">.</span><span style="color: #0000ff;">'&quot;&gt;'</span>
               <span style="color: #339933;">.</span><span style="color: #000088;">$the_title_value</span><span style="color: #339933;">.</span><span style="color: #0000ff;">'&lt;/a&gt;&lt;span class=&quot;updatetime&quot;&gt;&lt;br /&gt;» 修改时间: '</span>
               <span style="color: #339933;">.</span>get_the_modified_time<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'Y.m.d G:i'</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">.</span><span style="color: #0000ff;">'&lt;/span&gt;&lt;/li&gt;'</span><span style="color: #339933;">;</span>
           <span style="color: #009900;">&#125;</span>
       <span style="color: #b1b100;">endwhile</span><span style="color: #339933;">;</span>
       wp_reset_query<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
       <span style="color: #b1b100;">if</span> <span style="color: #009900;">&#40;</span> <span style="color: #339933;">!</span><span style="color: #990000;">empty</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$recently_updated_posts</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#41;</span> update_option<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'recently_updated_posts'</span><span style="color: #339933;">,</span> <span style="color: #000088;">$recently_updated_posts</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
   <span style="color: #009900;">&#125;</span>
   <span style="color: #000088;">$recently_updated_posts</span><span style="color: #339933;">=</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$recently_updated_posts</span> <span style="color: #339933;">==</span> <span style="color: #0000ff;">''</span><span style="color: #009900;">&#41;</span> ? <span style="color: #0000ff;">'&lt;li&gt;None data.&lt;/li&gt;'</span> <span style="color: #339933;">:</span> <span style="color: #000088;">$recently_updated_posts</span><span style="color: #339933;">;</span>
   <span style="color: #b1b100;">echo</span> <span style="color: #000088;">$recently_updated_posts</span><span style="color: #339933;">;</span>
<span style="color: #009900;">&#125;</span>
&nbsp;
<span style="color: #000000; font-weight: bold;">function</span> clear_cache_zww<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
    update_option<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'recently_updated_posts'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">''</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span> <span style="color: #666666; font-style: italic;">// 清空 recently_updated_posts</span>
<span style="color: #009900;">&#125;</span>
add_action<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'save_post'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'clear_cache_zww'</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span> <span style="color: #666666; font-style: italic;">// 新发表文章/修改文章时触发更新</span>