WordPress默认的搜索结果按照文章的发布时间来排序，这样使我们无法搜索到最对自己口味的文章，其实有个办法可以让搜索结果按照相关性排列，
WordPress博客搜索结果按照相关性排序
。打开主题的 functions.php 文件，插入下面这段代码：
<span style="color: rgb(165, 42, 42); font-weight: normal; font-style. normal; " class="sh_keyword">if</span><span class="sh_symbol">(</span><span style="color: rgb(0, 0, 0); font-weight: bold; font-style. normal; " class="sh_function">is_search</span><span class="sh_symbol">())</span><span class="sh_cbracket">{</span>
<span style="color: rgb(0, 0, 0); font-weight: bold; font-style. normal; " class="sh_function">add_filter</span><span class="sh_symbol">(</span><span style="color: rgb(255, 0, 255); font-weight: normal; font-style. normal; " class="sh_string">'posts_orderby_request'</span><span class="sh_symbol">,</span> <span style="color: rgb(255, 0, 255); font-weight: normal; font-style. normal; " class="sh_string">'search_orderby_filter'</span><span class="sh_symbol">);</span>
<span class="sh_cbracket">}</span>
<span style="color: rgb(165, 42, 42); font-weight: normal; font-style. normal; " class="sh_keyword">function</span> <span style="color: rgb(0, 0, 0); font-weight: bold; font-style. normal; " class="sh_function">search_orderby_filter</span><span class="sh_symbol">(</span>$orderby <span class="sh_symbol">=</span> <span style="color: rgb(255, 0, 255); font-weight: normal; font-style. normal; " class="sh_string">''</span><span class="sh_symbol">)</span><span class="sh_cbracket">{</span>
global $wpdb<span class="sh_symbol">;</span>
$keyword <span class="sh_symbol">=</span> $wpdb<span class="sh_symbol">-></span><span style="color: rgb(0, 0, 0); font-weight: bold; font-style. normal; " class="sh_function">prepare</span><span class="sh_symbol">(</span>$_REQUEST<span class="sh_symbol">[</span><span style="color: rgb(255, 0, 255); font-weight: normal; font-style. normal; " class="sh_string">'s'</span><span class="sh_symbol">]);</span>
<span style="color: rgb(165, 42, 42); font-weight: normal; font-style. normal; " class="sh_keyword">return</span> <span style="color: rgb(255, 0, 255); font-weight: normal; font-style. normal; " class="sh_string">"((CASE WHEN {$wpdb->posts}.post_title LIKE '%{$keyword}%' THEN 2 ELSE 0 END) + (CASE WHEN {$wpdb->posts}.post_content LIKE '%{$keyword}%' THEN 1 ELSE 0 END)) DESC, {$wpdb->posts}.post_date DESC"</span><span class="sh_symbol">;</span>
<span class="sh_cbracket">}</span>
当然，这段代码只是考虑了最简单的情况，当文章标题含有关键字的时候给予权重值 2，内容里含有关键字的时候给予权重值 1，把两个权重值相加以后降序排列，
电脑资料
《WordPress博客搜索结果按照相关性排序》(https://www.unjs.com)。然后才用文章发布时间降序作为候补排序方法。根据我的测试，采用这种排序方法获得的搜索结果比默认的排序好多了。