对于那些正在寻找一个能够保持html标记的好摘录，并且希望该摘录不要打断句子中间部分，并且有一个真实的字数的人，下面是代码

 function pietergoosen_custom_wp_trim_excerpt($text) {
global $post;
$raw_excerpt = $text;
    if ( \'\' == $text ) {

        $text = get_the_content(\'\');
        $text = strip_shortcodes( $text );
        $text = apply_filters(\'the_content\', $text);
        $text = str_replace(\']]>\', \']]>\', $text);

            //Add the allowed HTML tags separated by a comma.
            $allowed_tags = array(
            \'head\', \'title\', \'base\', \'link\', \'meta\', \'style\', \'script\', \'noscript\', \'body\', \'section\', \'nav\',
            \'article\', \'aside\', \'h1\', \'h2\', \'h3\', \'h4\', \'h5\', \'h6\', \'header\', \'footer\', \'address\', \'main\', \'p\', \'hr\',
            \'pre\', \'blockquote\', \'ol\', \'ul\', \'li\', \'dl\', \'dt\', \'dd\', \'figure\', \'figcaption\', \'div\', \'a\', \'em\', \'strong\',
            \'small\', \'s\', \'cite\', \'q\', \'dfn\', \'abbr\', \'data\', \'time\', \'code\', \'var\', \'samp\', \'kbd\', \'sub\', \'sup\', \'i\', \'b\',
            \'u\', \'mark\', \'ruby\', \'rt\', \'rp\', \'bdi\', \'bdo\', \'span\', \'br\', \'wbr\', \'ins\', \'del\', \'img\', \'iframe\', \'embed\',
            \'object\', \'param\', \'video\' ,\'audio\', \'source\', \'track\', \'canvas\', \'map\', \'area\', \'svg\', \'math\', \'table\',
            \'caption\', \'colgroup\', \'col\', \'tbody\', \'thead\', \'tfoot\', \'tr\', \'td\', \'th\', \'form\', \'fieldset\', \'legend\', \'label\',
            \'input\', \'button\', \'select\', \'datalist\', \'optgroup\', \'option\', \'textarea\', \'keygen\', \'output\', \'progress\', \'meter\',
            \'details\', \'summary\', \'menuitem\', \'menu\'
            );

            $tag_string = \'<\' . implode(\'><\', $allowed_tags) . \'>\';

        $text = strip_tags($text, $tag_string);

        //Set the excerpt word count and only break after sentence is complete.
            $excerpt_word_count = 75;
            $excerpt_length = apply_filters(\'excerpt_length\', $excerpt_word_count); 
            $tokens = array();
            $excerptOutput = \'\';
            $count = 0;

            // Divide the string into tokens; HTML tags, or words, followed by any whitespace
            preg_match_all(\'/(<[^>]+>|[^<>\\s]+)\\s*/u\', $text, $tokens);

            foreach ($tokens[0] as $token) { 

                if ($count >= $excerpt_word_count && preg_match(\'/[\\?\\.\\!]\\s*$/uS\', $token)) { 
                // Limit reached, continue until ? . or ! occur at the end
                    $excerptOutput .= trim($token);
                    break;
                }

                // Add words to complete sentence
                $count++;

                // Append what\'s left of the token
                $excerptOutput .= $token;
            }

        $text = trim(force_balance_tags($excerptOutput));

            $excerpt_end = \' <a href="\'. esc_url( get_permalink() ) . \'">\' . \'&nbsp;&raquo;&nbsp;\' . sprintf(__( \'Read more about: %s &nbsp;&raquo;\', \'pietergoosen\' ), get_the_title()) . \'</a>\'; 
            $excerpt_more = apply_filters(\'excerpt_more\', \' \' . $excerpt_end); 

            $pos = strrpos($text, \'</\');

        // Add \'Read more\' text inside last HTML tag
        $text = substr_replace($text, $excerpt_end, $pos, 0);

    }
    return apply_filters(\'wp_trim_excerpt\', $text, $raw_excerpt);
}

remove_filter(\'get_the_excerpt\', \'wp_trim_excerpt\');
add_filter(\'get_the_excerpt\', \'pietergoosen_custom_wp_trim_excerpt\');