我使用过这样的代码，它（非常）松散地基于插件relevanssi: （在“functions.php”中）

// Roughly based on the relevanssi_do_excerpt() (https://wordpress.org/plugins/relevanssi/, GPLv2 or later), seriously simplified.
function mytheme_search_context( $haystack, $needles, $len = 30 ) {
    $ret = \'\';

    $haystack = strip_tags(mytheme_strip_invisibles($haystack));
    $haystack = trim( preg_replace( array( "/\\n\\r|\\r\\n|\\n|\\r/", \'/\\s\\s+/\', \'/&.{1,30}?;/\' ), \' \', $haystack ) );

    $words = explode( \' \', $haystack );

    for ( $i = 0, $cnt = count( $words ); $i < $cnt; $i += $len ) {
        $slice = array_slice( $words, $i, $len );
        $slice = \' \' . implode( \' \', $slice );

        $search = $replace = array();
        foreach ( $needles as $needle ) {
            $pos = mb_stripos( $slice, $needle );

            if ( $pos !== false ) {
                $target = mb_substr( $slice, $pos, mb_strlen( $needle ) );
                $search[] = $target;
                $replace[] = \'<strong>\' . $target . \'</strong>\';
            }
        }
        if ( $search ) {
            if ( $i ) {
                $ret .= \'&hellip; \';
            }
            if ( $i + $len > $cnt ) {
                $slice = array_slice( $words, $cnt - $len, $len );
                $slice = \' \' . implode( \' \', $slice );
                $ret .= str_replace( $search, $replace, $slice );
            } else {
                $ret .= str_replace( $search, $replace, $slice ) . \' &hellip;\';
            }
        }
    }

    return $ret;
}

// Straight copy of relevanssi_strip_invisibles().
// found here: http://forums.digitalpoint.com/showthread.php?t=1106745
function mytheme_strip_invisibles( $text ) {
    $text = preg_replace(
        array(
            \'@<style[^>]*?>.*?</style>@siu\',
            \'@<script[^>]*?.*?</script>@siu\',
            \'@<object[^>]*?.*?</object>@siu\',
            \'@<embed[^>]*?.*?</embed>@siu\',
            \'@<applet[^>]*?.*?</applet>@siu\',
            \'@<noscript[^>]*?.*?</noscript>@siu\',
            \'@<noembed[^>]*?.*?</noembed>@siu\',
            \'@<iframe[^>]*?.*?</iframe>@siu\',
            \'@<del[^>]*?.*?</del>@siu\',
        ),
        \' \',
        $text );
    return $text;
}

然后根据您的主题（您可能已经这样做了），将“search.php”复制到您的子主题，并更改行（如果有）<?php get_template_part( \'content\', get_post_format() ); ?> 到<?php get_template_part( \'content\', \'search\' ); ?>, 然后将主题的“content.php”复制到子主题中的“content search.php”，并替换该行（或等效行）the_extract(); 比如

        if ( $mytheme_search_context = mytheme_search_context( do_shortcode( get_the_content() ), get_query_var( \'search_terms\' ) ) ) {
            echo \'<p>\', $mytheme_search_context, \'</p>\';
        } elseif ( $get_the_excerpt = get_the_excerpt() ) {
            echo \'<p>\', strip_shortcodes( $get_the_excerpt ), \'</p>\';
        }