wordpress 自动内链标签及自动内链关键字

/* 自动为文章内的标签添加内链开始 */
$match_num_from = 1; //一篇文章中同一个标签少于几次不自动链接
$match_num_to = 1; //一篇文章中同一个标签最多自动链接几次
function tag_sort($a, $b){
        if ( $a->name == $b->name ) return 0;
        return ( strlen($a->name) > strlen($b->name) ) ? - 1 : 1;
}
function tag_link($content){
        global $match_num_from,$match_num_to;
                $posttags = get_the_tags();
                if ($posttags) {
                        usort($posttags, "tag_sort");
                        foreach($posttags as $tag) {
                                $link = get_tag_link($tag->term_id);
                                $keyword = $tag->name;
                                $cleankeyword = stripslashes($keyword);
                                $url = "<a href=\"$link\" title=\"".str_replace( '%s',addcslashes($cleankeyword, '$'),__( 'View all posts in %s')). "\"";
                                $url .= ' target="_blank"';
                                $url .= ">".addcslashes($cleankeyword, '$'). "</a>";
                                $limit = rand($match_num_from,$match_num_to);
                                $content = preg_replace( '|(<a[^>]+>)(.*)('.$ex_word. ')(.*)(</a[^>]*>)|U'.$case, '$1$2%&&&&&%$4$5', $content);
                                $content = preg_replace( '|(<img)(.*?)('.$ex_word. ')(.*?)(>)|U'.$case, '$1$2%&&&&&%$4$5', $content);
                                $cleankeyword = preg_quote($cleankeyword, '\'');
                                $regEx = '\'(?!((<.*?)|(<a.*?)))('. $cleankeyword . ')(?!(([^<>]*?)>)|([^>]*?</a>))\'s' . $case;
                                $content = preg_replace($regEx,$url,$content,$limit);
                                $content = str_replace( '%&&&&&%', stripslashes($ex_word), $content);
                        }
                }
        return $content;
}
add_filter( 'the_content', 'tag_link', 1);
/* 自动为文章内的标签添加内链结束 *
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版权声明：本文为CSDN博主「youcijibi」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/youcijibi/article/details/78363078

/* 文章指定关键词添加内链开始 */
function replace_text_wps($text){
        $replace = array(
                '余斗余斗' => '<a href="http://www.yudouyudou.com/" target="_blank" title="余斗余斗">余斗余斗</a>',
                '余斗博客' => '<a href="http://m.yudouyudou.com/" target="_blank" title="余斗博客">余斗博客</a>',
                '教程' => '<a href="http://www.yudouyudou.com/jiaochengheji/" target="_blank" title="教程">教程</a>'
        );
        $text = str_replace(array_keys($replace), $replace, $text);
        return $text;
}
     
add_filter( 'the_content', 'replace_text_wps');
————————————————
版权声明：本文为CSDN博主「youcijibi」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/youcijibi/article/details/78363078