WordPress优化之给文章标签自动添加内链

文章内链的重要性，很多做SEO的朋友都应该知道。内部链接结构可以引导权值的传递，提高收录，提升内页排名。

如何给WordPress博客的文章关键词标签自动添加内链呢？其实我们只需要在主题目录下的functions.php文件中添加一段代码就可以实现了。

//WordPress 文章关键词自动内链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){$match_num_from = 1;//一个标签少于几次不链接$match_num_to = 1;//一个标签最多链接几次$posttags = get_the_tags();if ($posttags) {usort($posttags, \"tag_sort\");foreach($posttags as $tag) {$link = get_tag_link($tag->term_id);$keyword = $tag->name;//链接代码$cleankeyword = stripslashes($keyword);$url = \"<a href=\\\"$link\\\" title=\\\"\".str_replace(\'{5cc1b29162d549a8071384de182cc9fc6e6a0fd85e7907f22fd9e18cff4269c3}s\',addcslashes($cleankeyword, \'$\'),__(\'更多关于 {5cc1b29162d549a8071384de182cc9fc6e6a0fd85e7907f22fd9e18cff4269c3}s 的文章\')).\"\\\"\";$url .= \' target=\"_blank\"\';$url .= \">\".addcslashes($cleankeyword, \'$\').\"</a>\";$limit = rand($match_num_from,$match_num_to);//不链接代码$content = preg_replace( \'|(<a[^>]+>)(.*)<pre.*?>(\'.$ex_word.\')(.*)<\\/pre>(</a[^>]*>)|U\'.$case, \'$1$2{5cc1b29162d549a8071384de182cc9fc6e6a0fd85e7907f22fd9e18cff4269c3}&&&&&{5cc1b29162d549a8071384de182cc9fc6e6a0fd85e7907f22fd9e18cff4269c3}$4$5\', $content);$content = preg_replace( \'|(<img)(.*?)(\'.$ex_word.\')(.*?)(>)|U\'.$case, \'$1$2{5cc1b29162d549a8071384de182cc9fc6e6a0fd85e7907f22fd9e18cff4269c3}&&&&&{5cc1b29162d549a8071384de182cc9fc6e6a0fd85e7907f22fd9e18cff4269c3}$4$5\', $content);$cleankeyword = preg_quote($cleankeyword,\'\\\'\');$regEx = \'\\\'(?!((<.*?)|(<a.*?)))(\'. $cleankeyword . \')(?!(([^<>]*?)>)|([^>]*?</a>))\\\'s\' . $case;$content = preg_replace($regEx,$url,$content,$limit);$content = str_replace( \'{5cc1b29162d549a8071384de182cc9fc6e6a0fd85e7907f22fd9e18cff4269c3}&&&&&{5cc1b29162d549a8071384de182cc9fc6e6a0fd85e7907f22fd9e18cff4269c3}\', stripslashes($ex_word), $content);}}return $content;}add_filter(\'the_content\',\'tag_link\',1);