如果您设置domain.com 作为的别名original.com, 在WordPress中，您无需采取任何措施即可使其正常工作。

问题是数量：一旦在DNS中，这两个域就是别名，every WordPress的url可通过用户定义的域访问：domain.com/any/wp/url, 而且domain2.com/any/wp/url, domain3.com/any/wp/url 等等

所以，你要做的是

检查url是否为用户定义的域之一如果是，检查请求的页面是否为单数CPT及其授权保存域的页面如果不是，将请求重定向到原始域wp-config.php

define(\'ORIGINAL_DOMAIN\', \'original.com\');

现在，您可以轻松实现上述工作流：

add_action(\'template_redirect\', \'check_request_domain\', 1);

function check_request_domain() {
  $domain = filter_input(INPUT_SERVER, \'HTTP_HOST\', FILTER_SANITIZE_URL);
  // strip out the \'www.\' part if present
  $domain = str_replace( \'www.\', \'\', $domain);

  // if the request is from original domain do nothing
  if ( $domain === ORIGINAL_DOMAIN ) return;

  // if it is not a singular company CPT request redirect to same request
  // but on original domain
  if ( ! is_singular(\'company\') ) {
    redirect_to_original(); // function defined below
  }

  // if we are here the request is from an user domain and for a singular company request
  // let\'s check if the author of the post has user meta, assuming meta key is `\'domain\'`
  // and the meta value is the same of domain in current url

  $meta = get_user_meta( get_queried_object()->post_author, \'domain\', TRUE ); 

  if ( $meta !== $domain ) { // meta doesn\'t match, redirect
     redirect_to_original(); // function defined below
  } else {
    // meta match, only assuring that WordPress will not redirect canonical url
    remove_filter(\'template_redirect\', \'redirect_canonical\');
  }
}

现在，让我们编写一个函数，使用当前url重定向请求，但使用原始域

/**
 * Redirect the request to same url, but using original domain
 */
function redirect_to_original() {
  $original = untrailingslashit( home_url() ) . add_query_arg( array() );
  wp_safe_redirect( $original, 301 );
  exit();
}

最后要做的事情是过滤永久链接创建，以便将用户定义的域用于单个公司CPT URL：

add_filter( \'post_type_link\', \'custom_user_domain_plink\', 999, 2 );

function custom_user_domain_plink( $post_link, $post ) {
  // we want change permalink only for company cpt posts
  if ( $post->post_type !== \'company\' ) return $post_link;

  // has the user setted a custom domain? If not, do nothing
  $custom = get_user_meta( $post->post_author, \'domain\', TRUE );
  if ( empty($custom) ) return $post_link;

  // let\'s replace the original domain, with the custom one, and return new value
  return str_replace( ORIGINAL_DOMAIN, $custom, $post_link);
}

At this point, you have only set DNS for your server, where all the user defined domains are aliases of the original.

请注意，代码未经测试。