WordPress 自动为文章标签(关键词)添加该标签的链接

/** * WordPress 自动为文章标签添加该标签的链接 * http://www.wpdaxue.com/auto-add-tag-link.html */$match_num_from = 1;  // 一个标签在文章中出现少于多少次不添加链接$match_num_to = 1; // 一篇文章中同一个标签添加几次链接add_filter('the_content','tag_link',1);//按长度排序function tag_sort($a, $b){if ( $a->name == $b->name ) return 0;return ( strlen($a->name) > strlen($b->name) ) ? -1 : 1;}//为符合条件的标签添加链接function tag_link($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 = $tag->name;//链接的代码$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);//不链接的代码$content = preg_replace( '|(<a[^>]+>)(.*)('.$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;}