站长朋友们在使用wordpress 建站的过程中会发现，wordpress 默认的搜索功能还是挺弱的，搜索出来的结果不符合人意，如果您想让它检索出来的结果更加相关，可以限定只搜索文章的标题，下面我们就来介绍一下实现的方法。

切换到主题目录，打开 functions.PHP 文件，加入以下代码即可：

Crayon-5c891cc516804119172092" class="Crayon-Syntax Crayon-theme-classic Crayon-font-monaco Crayon-os-pc print-yes notranslate" data-settings=" minimize scroll-mouSEOver" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;">

Crayon-toolbar" data-settings=" mouSEOver overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">Crayon-title">functions.PHP

Crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;">

Crayon-button Crayon-nums-button" title="Toggle Line Numbers">

Crayon-button-icon">

Crayon-button Crayon-plain-button" title="Toggle Plain Code">

Crayon-button-icon">

Crayon-button Crayon-wrap-button" title="Toggle Line Wrap">

Crayon-button-icon">

Crayon-button Crayon-expand-button" title="Expand Code">

Crayon-button-icon">

Crayon-button Crayon-copy-button" title="Copy">

Crayon-button-icon">

Crayon-button Crayon-popup-button" title="Open Code In New Window">

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Crayon-language">PHP

Crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;">

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query_vars['search_terms'] ) ) {
        global <a href="https://www.jb51.cc/tag/wpdb/" target="_blank" class="keywords">$wpdb</a>;

        $q = $wp_query->query_vars;
        $n = ! empty( $q['exact'] ) ? '' : '%';

        $search = array();

        foreach ( ( array ) $q['search_terms'] as $term )
            $search[] = <a href="https://www.jb51.cc/tag/wpdb/" target="_blank" class="keywords">$wpdb</a>->prepare( "<a href="https://www.jb51.cc/tag/wpdb/" target="_blank" class="keywords">$wpdb</a>->posts.post_title LIKE %s",$n . <a href="https://www.jb51.cc/tag/wpdb/" target="_blank" class="keywords">$wpdb</a>->esc_like( $term ) . $n );

        if ( ! is_user_logged_in() )
            $search[] = "<a href="https://www.jb51.cc/tag/wpdb/" target="_blank" class="keywords">$wpdb</a>->posts.post_password = ''";

        $search = ' AND ' . implode( ' AND ',$search );
    }

    return $search;
}

add_filter( 'posts_search','wp_search_by_title',10,2 );

Crayon-main" style="">Crayon-table">Crayon-row">

Crayon-nums " data-settings="show">

Crayon-nums-content" style="font-size: 12px !important; line-height: 15px !important;">

Crayon-num" data-line="Crayon-5c891cc516804119172092-1">1

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-2">2

Crayon-num" data-line="Crayon-5c891cc516804119172092-3">3

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-4">4

Crayon-num" data-line="Crayon-5c891cc516804119172092-5">5

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-6">6

Crayon-num" data-line="Crayon-5c891cc516804119172092-7">7

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-8">8

Crayon-num" data-line="Crayon-5c891cc516804119172092-9">9

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-10">10

Crayon-num" data-line="Crayon-5c891cc516804119172092-11">11

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-12">12

Crayon-num" data-line="Crayon-5c891cc516804119172092-13">13

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-14">14

Crayon-num" data-line="Crayon-5c891cc516804119172092-15">15

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-16">16

Crayon-num" data-line="Crayon-5c891cc516804119172092-17">17

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-18">18

Crayon-num" data-line="Crayon-5c891cc516804119172092-19">19

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-20">20

Crayon-num" data-line="Crayon-5c891cc516804119172092-21">21

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-22">22

Crayon-num" data-line="Crayon-5c891cc516804119172092-23">23

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-24">24

Crayon-num" data-line="Crayon-5c891cc516804119172092-25">25

Crayon-num Crayon-striped-num" data-line="Crayon-5c891cc516804119172092-26">26

Crayon-num" data-line="Crayon-5c891cc516804119172092-27">27

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Crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;">

Crayon-line" id="Crayon-5c891cc516804119172092-1">Crayon-c">/**

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-2">Crayon-c"> * Search sql filter for matching against post title only.

Crayon-line" id="Crayon-5c891cc516804119172092-3">Crayon-c"> * @param string$search

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-4">Crayon-c"> * @param WP_Query$wp_query

Crayon-line" id="Crayon-5c891cc516804119172092-5">Crayon-c">*/

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-6">Crayon-t">functionCrayon-h"> Crayon-e">wp_search_by_titleCrayon-sy">(Crayon-h"> Crayon-v">$searchCrayon-sy">,Crayon-h"> Crayon-v">$wp_queryCrayon-h"> Crayon-sy">)Crayon-h"> Crayon-sy">{

Crayon-line" id="Crayon-5c891cc516804119172092-7">Crayon-h">Crayon-st">ifCrayon-h"> Crayon-sy">(Crayon-h"> Crayon-o">!Crayon-h"> Crayon-k ">emptyCrayon-sy">(Crayon-h"> Crayon-v">$searchCrayon-h"> Crayon-sy">)Crayon-h"> Crayon-o">&&Crayon-h"> Crayon-o">!Crayon-h"> Crayon-k ">emptyCrayon-sy">(Crayon-h"> Crayon-v">$wp_queryCrayon-i">query_varsCrayon-sy">[Crayon-s">'search_terms'Crayon-sy">]Crayon-h"> Crayon-sy">)Crayon-h"> Crayon-sy">)Crayon-h"> Crayon-sy">{

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-8">Crayon-h">Crayon-m">globalCrayon-h"> Crayon-v">$wpdbCrayon-sy">;

Crayon-line" id="Crayon-5c891cc516804119172092-9">

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-10">Crayon-h">Crayon-v">$qCrayon-h"> Crayon-o">=Crayon-h"> Crayon-v">$wp_queryCrayon-i">query_varsCrayon-sy">;

Crayon-line" id="Crayon-5c891cc516804119172092-11">Crayon-h">Crayon-v">$nCrayon-h"> Crayon-o">=Crayon-h"> Crayon-o">!Crayon-h"> Crayon-k ">emptyCrayon-sy">(Crayon-h"> Crayon-v">$qCrayon-sy">[Crayon-s">'exact'Crayon-sy">]Crayon-h"> Crayon-sy">)Crayon-h"> Crayon-sy">?Crayon-h"> Crayon-s">''Crayon-h"> Crayon-o">:Crayon-h"> Crayon-s">'%'Crayon-sy">;

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-12">

Crayon-line" id="Crayon-5c891cc516804119172092-13">Crayon-h">Crayon-v">$searchCrayon-h"> Crayon-o">=Crayon-h"> Crayon-t">arrayCrayon-sy">(Crayon-sy">)Crayon-sy">;

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-14">

Crayon-line" id="Crayon-5c891cc516804119172092-15">Crayon-h">Crayon-st">foreachCrayon-h"> Crayon-sy">(Crayon-h"> Crayon-sy">(Crayon-h"> Crayon-t">arrayCrayon-h"> Crayon-sy">)Crayon-h"> Crayon-v">$qCrayon-sy">[Crayon-s">'search_terms'Crayon-sy">]Crayon-h"> Crayon-st">asCrayon-h"> Crayon-v">$termCrayon-h"> Crayon-sy">)

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-16">Crayon-h">Crayon-v">$searchCrayon-sy">[Crayon-sy">]Crayon-h"> Crayon-o">=Crayon-h"> Crayon-v">$wpdbCrayon-e">prepareCrayon-sy">(Crayon-h"> posts.post_title LIKE %s"Crayon-sy">,Crayon-h"> Crayon-v">$nCrayon-h"> Crayon-sy">.Crayon-h"> Crayon-v">$wpdbCrayon-e">esc_likeCrayon-sy">(Crayon-h"> Crayon-v">$termCrayon-h"> Crayon-sy">)Crayon-h"> Crayon-sy">.Crayon-h"> Crayon-v">$nCrayon-h"> Crayon-sy">)Crayon-sy">;

Crayon-line" id="Crayon-5c891cc516804119172092-17">

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-18">Crayon-h">Crayon-st">ifCrayon-h"> Crayon-sy">(Crayon-h"> Crayon-o">!Crayon-h"> Crayon-e">is_user_logged_inCrayon-sy">(Crayon-sy">)Crayon-h"> Crayon-sy">)

Crayon-line" id="Crayon-5c891cc516804119172092-19">Crayon-h">Crayon-v">$searchCrayon-sy">[Crayon-sy">]Crayon-h"> Crayon-o">=Crayon-h"> posts.post_password = ''"Crayon-sy">;

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-20">

Crayon-line" id="Crayon-5c891cc516804119172092-21">Crayon-h">Crayon-v">$searchCrayon-h"> Crayon-o">=Crayon-h"> Crayon-s">' AND 'Crayon-h"> Crayon-sy">.Crayon-h"> Crayon-e">implodeCrayon-sy">(Crayon-h"> Crayon-s">' AND 'Crayon-sy">,Crayon-h"> Crayon-v">$searchCrayon-h"> Crayon-sy">)Crayon-sy">;

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-22">Crayon-h">Crayon-sy">}

Crayon-line" id="Crayon-5c891cc516804119172092-23">

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-24">Crayon-h">Crayon-k ">returnCrayon-h"> Crayon-v">$searchCrayon-sy">;

Crayon-line" id="Crayon-5c891cc516804119172092-25">Crayon-sy">}

Crayon-line Crayon-striped-line" id="Crayon-5c891cc516804119172092-26">

Crayon-line" id="Crayon-5c891cc516804119172092-27">Crayon-e">add_filterCrayon-sy">(Crayon-h"> Crayon-s">'posts_search'Crayon-sy">,Crayon-h"> Crayon-s">'wp_search_by_title'Crayon-sy">,Crayon-h"> Crayon-cn">10Crayon-sy">,Crayon-h"> Crayon-cn">2Crayon-h"> Crayon-sy">)Crayon-sy">;

有需要的朋友可以使用上面的代码测试一下。

原文链接：https://www.f2er.com/wordpress/238376.html

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