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202						<h1>WordPress 搜索页支持搜索自定义字段的方法</h1>
203						<div class="text-muted text-sm">
204						<span class="date"><i class="iconfont icon-time"></i>&nbsp;5年前 &nbsp;&nbsp;
205						<i class="iconfont icon-eye"></i>&nbsp;7.4K&nbsp;&nbsp;</span>
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232										<p>自定义字段是WordPress中非常强大的功能之一,在通过使用自定义帖子类型来扩展WordPress时,这个功能特别有用。我在开发OneNav主题时,创建了很多自定义字段,为帖子添加细节,比如收藏网址的Url地址,App的版本,书籍的刊号等等。不幸的是,WordPress 搜索页不能搜索出自定义字段的内容。为了解决这个问题,需要修改WordPress的搜索查询以包括自定义字段。</p>
233<p>这里我贴出俩种方法共大家选择,分别为<code>LEFT JOIN</code>和<code>EXISTS</code>。</p>
234<div class="post-ad">
234<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
234
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240     data-ad-slot="9341992924"></ins>
241<script>
242     (adsbygoogle = window.adsbygoogle || []).push({});
243</script>
243</div>
244<h2>LEFT JOIN 方法</h2>
245<p>此方法分为三步</p>
246<h3>1、Left Join</h3>
247<p>默认情况下,WordPress 搜索功能设置为仅搜索<code>posts</code>表,为了在我们的搜索中包含自定义字段数据,我们首先需要对数据库中的<code>postmeta</code>表执行左连接。</p>
248<h3>2、修改查询条件</h3>
249<p>修改 WordPress 的搜索查询包含自定义字段。</p>
250<h3>3、防止重复</h3>
251<p>此方法查询出的数据会产生重复项,我们需要在 <code>SQL</code> 查询中添加<code> DISTINCT</code> 关键字,以防止返回重复项。</p>
252<p>完整代码如下:</p>
253<pre class="ioch-code" data-enlighter-language="php">/**
254 * WordPress 搜索页支持搜索自定义字段的方法
255 * 原文地址:https://www.iowen.cn/wordpress-search-page-supports-custom-fields/
256 *
257 * 修改搜索查询的sql代码,将postmeta表左链接进去。
258 */
259function io_search_join( $join, $query ) {
260    global $wpdb;
261    if ( is_search() &amp;&amp; $query-&gt;is_main_query() &amp;&amp; !empty($query-&gt;query['s']) ) {
262        $join .=' LEFT JOIN '. $wpdb-&gt;postmeta . ' AS post_metas ON ' . $wpdb-&gt;posts . '.ID = post_metas.post_id ';
263    }
264    return $join;
265}
266add_filter('posts_join', 'io_search_join',10,2 );
267
268/**
269 * 在wordpress查询代码中加入自定义字段值的查询。
270 */
271function io_search_where( $where, $query ) {
272    global $pagenow, $wpdb;
273    if ( is_search() &amp;&amp; $query-&gt;is_main_query() &amp;&amp; !empty($query-&gt;query['s']) ) {
274        $meta_key = "'_sites_link','_spare_sites_link','_seo_desc','_sescribe','_down_list'"; //需搜索的自定义字段键名
275        $where = preg_replace("/\(\s*".$wpdb-&gt;posts.".post_title\s+LIKE\s*(\'[^\']+\')\s*\)/","({$wpdb-&gt;posts}.post_title LIKE $1) OR ((post_metas.meta_value LIKE $1) AND (post_metas.meta_key IN ({$meta_key})))", $where ); 
276    }
277    return $where;
278}
279add_filter('posts_where', 'io_search_where',10,2);
280
281/**
282 * 在 SQL 查询中添加 DISTINCT 关键字,以防止返回重复项
283 */
284function io_search_distinct( $where, $query) {
285    global $wpdb;
286    if ( is_search() &amp;&amp; $query-&gt;is_main_query() &amp;&amp; !empty($query-&gt;query['s']) )  {
287        return 'DISTINCT';
288    }
289    return $where;
290}
291add_filter( "posts_distinct", "io_search_distinct",10,2 );
292</pre>
293<h2>EXISTS 方法</h2>
294<div class="post-ad">
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304<pre class="ioch-code" data-enlighter-language="php">/**
305 * WordPress 搜索页支持搜索自定义字段的方法
306 * 原文地址:https://www.iowen.cn/wordpress-search-page-supports-custom-fields/
307 *
308 * EXISTS 方法查询自定义字段
309 */
310function io_posts_search_where($search, $query){
311    global $wpdb; 
312    if (is_search() &amp;&amp; $query-&gt;is_main_query() &amp;&amp; !empty($query-&gt;query['s'])) {
313        $meta_key = "'_sites_link','_spare_sites_link','_seo_desc','_sescribe','_down_list'"; //需搜索的自定义字段键名
314        $sql = " OR EXISTS (SELECT * FROM {$wpdb-&gt;postmeta} WHERE post_id={$wpdb-&gt;posts}.ID AND meta_key IN ({$meta_key}) AND meta_value like %s)"; 
315        $like = '%' . $wpdb-&gt;esc_like($query-&gt;query['s']) . '%'; 
316        $where = $wpdb-&gt;prepare($sql, $like);
317        $search = preg_replace("/\(\s*".$wpdb-&gt;posts.".post_title\s+LIKE\s*(\'[^\']+\')\s*\)/","({$wpdb-&gt;posts}.post_title LIKE $1) {$where}", $search ); 
318    } 
319    return $search; 
320}
321add_action('posts_search', 'io_posts_search_where',10,2);
322</pre>
323<h2>使用方法</h2>
324<p>使用方法很简单,还是万年不变的将上面俩种方法的任意一种代码添加到WordPress主题的“functions.php”文件中即可。</p>
325<p>此代码不仅会修改前端的搜索,而且同时应用在了后端,你可以在后台文章列表搜索到自定义字段中包含搜索值的文章。</p>
326<div class="tip info "><p>代码中<code>$meta_key</code>为需要查询的自定义字段,自定义字段非常多,把你想要检索到的字段添加到这个变量里面</p>
327</div>
328<h2>区别&amp;性能</h2>
329<p>如果你就几百篇文章,上面方法随便选;如果文章很多,根据我在一个 <code>postmeta</code> 表7w数据和 <code>posts</code> 表6k数据的数据库中测试,<code>EXISTS</code> 方法比 <code>LEFT JOIN</code> 基本上快一半的时间,数据库知识薄弱,如果有啥不对的地方,欢迎指正。</p>
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454if" /></a><a class="add-smily" data-smilies=":kuaikule:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_kuaikule.gif" /></a><a class="add-smily" data-smilies=":kelian:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_kelian.gif" /></a><a class="add-smily" data-smilies=":idea:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_idea.gif" /></a><a class="add-smily" data-smilies=":haqian:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_haqian.gif" /></a><a class="add-smily" data-smilies=":hanxiao:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_hanxiao.gif" /></a><a class="add-smily" data-smilies=":haixiu:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_haixiu.gif" /></a><a class="add-smily" data-smilies=":grin:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_biggrin.gif" /></a><a class="add-smily" data-smilies=":gouyin:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_gouyin.gif" /></a><a class="add-smily" data-smilies=":fendou:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_fendou.gif" /></a><a class="add-smily" data-smilies=":evil:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_evil.gif" /></a><a class="add-smily" data-smilies=":eek:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_surprised.gif" /></a><a class="add-smily" data-smilies=":deyi:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_deyi.gif" /></a><a class="add-smily" data-smilies=":daku:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_daku.gif" /></a><a class="add-smily" data-smilies=":cry:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_cry.gif" /></a><a class="add-smily" data-smilies=":cool:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_cool.gif" /></a><a class="add-smily" data-smilies=":baoquan:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_baoquan.gif" /></a><a class="add-smily" data-smilies=":arrow:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_arrow.gif" /></a><a class="add-smily" data-smilies=":aixin:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_aixin.gif" /></a><a class="add-smily" data-smilies=":aini:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_aini.gif" /></a><a class="add-smily" data-smilies=":???:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_confused.gif" /></a><a class="add-smily" data-smilies=":?:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_question.gif" /></a><a class="add-smily" data-smilies=":!:"><img class="lazy no-bg m-1" data-src="https://www.iowen.cn/wp-content/themes/ioswallow/images/smilies/icon_exclaim.gif" /></a>						</div>
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470			        <li class="comment even thread-even depth-1" id="li-comment-1419">
471            <div id="comment-1419" class="comment_body contents">    
472                <div class="profile"> 
473                    <img src="https://www.iowen.cn/wp-content/themes/ioswallow/images/loading.gif" data-src="https://cdn2.iocdn.cc/avatar/de3a110bfa97beec5a23af14a7730ac9?s=96&d=monsterid&r=g" class="avatar v-avatar" height="96" width="96" alt="">                </div>                    
474                <section class="commeta">
475                    <div class="left">
476                        <h4 class="author">
476同花                        <span class="rank" data-balloon="头衔:VIP 1 , 全站累计评论数:1" data-balloon-pos="right">( VIP 1 )</span>                        </h4> 
477                                                <span class="info-location text-xs mt-2 d-block"><i class="iconfont icon-location mr-1"></i>未知</span>
478                                            </div>
479                    <a rel='nofollow' class='comment-reply-link' href='#comment-1419' onclick='return addComment.moveForm( "comment-1419", "1419", "respond", "2633" )' aria-label='回复给 同花'>回复</a>                    <div class="right">
480                        <div class="info"><time itemprop="datePublished" datetime="2024-09-07T19:37:47+08:00">2年前</time></div>
481                    </div>
482                </section>
483                <div class="body">
484                    <p>可以在编辑器中使用快捷键吗?</p>
485 
486                                    </div>
487            </div>
488        
489        </li><!-- #comment-## -->
490        <li class="comment odd alt thread-odd thread-alt depth-1" id="li-comment-1414">
491            <div id="comment-1414" class="comment_body contents">    
492                <div class="profile"> 
493                    <img src="https://www.iowen.cn/wp-content/themes/ioswallow/images/loading.gif" data-src="https://q3.qlogo.cn/headimg_dl?dst_uin=1024078948&spec=100" class="avatar v-avatar" height="96" width="96" alt="">                </div>                    
494                <section class="commeta">
495                    <div class="left">
496                        <h4 class="author"><a href='https://www.iowen.cn/go/?url=aHR0cHM6Ly93d3cuOTBsaGQuY29tLw%3D%3D' target='_blank' rel='external nofollow' class='url'>惦记博客</a>                        <span class="rank" data-balloon="头衔:VIP 1 , 全站累计评论数:4" data-balloon-pos="right">( VIP 1 )</span>                        </h4> 
497                                                <span class="info-location text-xs mt-2 d-block"><i class="iconfont icon-location mr-1"></i>贵州</span>
498                                            </div>
499                    <a rel='nofollow' class='comment-reply-link' href='#comment-1414' onclick='return addComment.moveForm( "comment-1414", "1414", "respond", "2633" )' aria-label='回复给 惦记博客'>回复</a>                    <div class="right">
500                        <div class="info"><time itemprop="datePublished" datetime="2024-08-11T16:23:33+08:00">2年前</time></div>
501                    </div>
502                </section>
503                <div class="body">
504                    <p>有人不?</p>
505 
506                                    </div>
507            </div>
508        
509        </li><!-- #comment-## -->
510        <li class="comment even thread-even depth-1" id="li-comment-1411">
511            <div id="comment-1411" class="comment_body contents">    
512                <div class="profile"> 
513                    <img src="https://www.iowen.cn/wp-content/themes/ioswallow/images/loading.gif" data-src="https://q1.qlogo.cn/headimg_dl?dst_uin=1024078948&spec=100" class="avatar v-avatar" height="96" width="96" alt="">                </div>                    
514                <section class="commeta">
515                    <div class="left">
516                        <h4 class="author"><a href='https://www.iowen.cn/go/?url=aHR0cHM6Ly93d3cuOTBsaGQuY29tLw%3D%3D' target='_blank' rel='external nofollow' class='url'>惦记°</a>                        <span class="rank" data-balloon="头衔:VIP 1 , 全站累计评论数:4" data-balloon-pos="right">( VIP 1 )</span>                        </h4> 
517                                                <span class="info-location text-xs mt-2 d-block"><i class="iconfont icon-location mr-1"></i>广西</span>
518                                            </div>
519                    <a rel='nofollow' class='comment-reply-link' href='#comment-1411' onclick='return addComment.moveForm( "comment-1411", "1411", "respond", "2633" )' aria-label='回复给 惦记°'>回复</a>                    <div class="right">
520                        <div class="info"><time itemprop="datePublished" datetime="2024-08-09T01:31:35+08:00">2年前</time></div>
521                    </div>
522                </section>
523                <div class="body">
524                    <p>代码框 背景改成黑色</p>
525 
526                                    </div>
527            </div>
528        
529        </li><!-- #comment-## -->
530        <li class="comment odd alt thread-odd thread-alt depth-1" id="li-comment-1410">
531            <div id="comment-1410" class="comment_body contents">    
532                <div class="profile"> 
533                    <img src="https://www.iowen.cn/wp-content/themes/ioswallow/images/loading.gif" data-src="https://q2.qlogo.cn/headimg_dl?dst_uin=1024078948&spec=100" class="avatar v-avatar" height="96" width="96" alt="">                </div>                    
534                <section class="commeta">
535                    <div class="left">
536                        <h4 class="author"><a href='https://www.iowen.cn/go/?url=aHR0cHM6Ly93d3cuOTBsaGQuY29tLw%3D%3D' target='_blank' rel='external nofollow' class='url'>惦记°</a>
536                        <span class="rank" data-balloon="头衔:VIP 1 , 全站累计评论数:4" data-balloon-pos="right">( VIP 1 )</span>                        </h4> 
537                                                <span class="info-location text-xs mt-2 d-block"><i class="iconfont icon-location mr-1"></i>广西</span>
538                                            </div>
539                    <a rel='nofollow' class='comment-reply-link' href='#comment-1410' onclick='return addComment.moveForm( "comment-1410", "1410", "respond", "2633" )' aria-label='回复给 惦记°'>回复</a>                    <div class="right">
540                        <div class="info"><time itemprop="datePublished" datetime="2024-08-09T01:31:03+08:00">2年前</time></div>
541                    </div>
542                </section>
543                <div class="body">
544                    <p>这么变成黑色呢,白色不太好看  想换成纯黑</p>
545 
546                                    </div>
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548        
549        </li><!-- #comment-## -->
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588        <div class="text-muted">热门文章</div>
589        <div class="mt-2 hot-post px-1" auto-load data-box="https://www.iowen.cn/wp-admin/admin-ajax.php?action=search_hot_post"><div class="py-4 text-muted text-center null-loading border-radius-md">Lading...</div></div>
590    </div></div><div class="text-center"><a class="nav-search-close" href="javascript:;" data-toggle="nav" data-target=".nav-search"><i class="iconfont icon-error"></i></a></div></div></div><div class="fixed-body blur-fixed" data-toggle="nav" data-target=".nav-search"></div></div><div class="modal fade" id="io-img-modal" tabindex="-1" role="dialog" aria-hidden="true">
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594                        <button type="button" id="close-sites-modal" class="close io-close" data-dismiss="modal" aria-label="Close"><i aria-hidden="true" class="iconfont icon-close text-xl"></i></button>
595                    </div>
596                    <div class="dl"></div>
597                    <div class="modal-body"><div class="box-body">
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599            <textarea id="io-img-url" rows="2" tabindex="1" class=" comment-text w-100 input-textarea" style="height:60px;" placeholder="http://..."></textarea>
600        </div>
601        <a id="io-img-url-btn" class="btn vc-theme btn-shadow btn-hover-dark btn-block mt-3" href="javascript:;">确认插入</a></div>
602                </div>
603            </div>
604        </div><div class="modal fade" id="io-code-modal" tabindex="-1" role="dialog" aria-hidden="true">
605            <div class="modal-mini modal-dialog modal-dialog-centered" role="document">
606                <div class="modal-content dlb no-border border-radius">
607                    <div class="modal-header no-border"><p class="text-lg text-center">
607插入代码</p>
608                        <button type="button" id="close-sites-modal" class="close io-close" data-dismiss="modal" aria-label="Close"><i aria-hidden="true" class="iconfont icon-close text-xl"></i></button>
609                    </div>
610                    <div class="dl"></div>
611                    <div class="modal-body"><div class="box-body">
612            <div class="mb-2 text-sm text-muted">请填写代码:</div>
613            <textarea id="io-code-text" rows="2" tabindex="1" class=" comment-text w-100 input-textarea" style="height:160px;"></textarea>
614        </div>
615        <a id="io-add-code-btn" class="btn vc-theme btn-shadow btn-hover-dark btn-block mt-3" href="javascript:;">确认插入</a></div>
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617            </div>
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