不管是百度还是谷歌，现在都提倡使用别名作为标签的链接，哪怕是纯中文汉字！这样在搜索结果中，用户能一眼看到标签页面是关于什么的页面。这篇文章仅用作技术备份，不建议以后使用。

//标签链接使用id作为链接
add_action('generate_rewrite_rules','tag_rewrite_rules');
add_filter('term_link','tag_term_link',10,3);
add_action('query_vars', 'tag_query_vars');
function tag_rewrite_rules($wp_rewrite){
$new_rules = array(
'tag/(\d+)/feed/(feed|rdf|rss|rss2|atom)/?$' => 'index.php?tag_id=$matches[1]&feed=$matches[2]',
'tag/(\d+)/(feed|rdf|rss|rss2|atom)/?$' => 'index.php?tag_id=$matches[1]&feed=$matches[2]',
'tag/(\d+)/embed/?$' => 'index.php?tag_id=$matches[1]&embed=true',
'tag/(\d+)/page/(\d+)/?$' => 'index.php?tag_id=$matches[1]&paged=$matches[2]',
'tag/(\d+)/?$' => 'index.php?tag_id=$matches[1]',
);
$wp_rewrite->rules = $new_rules + $wp_rewrite->rules;
}

function tag_term_link($link,$term,$taxonomy){
if($taxonomy=='post_tag'){
return home_url('/tag/'.$term->term_id.'/');
}
return $link;
}

function tag_query_vars($public_query_vars){
$public_query_vars[] = 'tag_id';
return $public_query_vars;
}