很多SEO朋友应该知道文章内链的重要性。内部链接结构可以引导权重的传递，提高收藏，提高内部页面的排名。
如何将内链自动添加到wordpress博客的文章关键字标签中？实际上，我们只需要向主题目录中的functions.php文件添加一段代码。
//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" rel="external nofollow" 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);
