基于this answer 我创建了一个函数来更改来自域的短链接。tld？p=435到域。tld/435和重定向域。tld/435至域。tld/全永久性：

function shorter_shortlink() {
  global $post;
  $shortURL = get_bloginfo(\'url\').\'/\'.$post->ID;
  if(!empty($shortURL)) {
  return $shortURL;
  } else {
  return get_bloginfo(\'url\').\'/?p=\'.$post->ID;
  }
}
add_filter(\'pre_get_shortlink\', \'shorter_shortlink\'); 

add_action( \'wp\', function(){
  global $wp;
  if( is_numeric( $wp->request ) && empty( $wp->query_vars[\'page\'] ) )
  {
  wp_redirect( get_permalink( absint( $wp->request ) ), 301 );
  exit();
  }
});