免插件为WordPress文章中标签添加内链

给文章标签添加内链，意思就是说，如果你文章中出现了和标签一样的文字，那么这个文字就会自动成为标签链接，你点击这个链接就会查看到所有含有该标签的文章，这个能方便用户浏览，据说还利于SEO。下面说说方法：
把下面的代码添加到function.php中就可以了

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//自动为文章标签添加该标签的链接 $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; }

看看效果图：