此代码允许您设置自定义元值，如果域名（或子域，如果您编辑代码）与之匹配，则查询将更改为与该帖子匹配。页面模板将仅用于该请求，而不用于通过“正常”URL的请求。

这不会改变该页面上的链接：他们应该去“普通”网站还是留在子域中？

如何在DNS端解决此问题可能是a Server Fault question.

define( \'WPSE4558_STANDARD_SERVER\', \'www.example.com\' );
define( \'WPSE4558_META_KEY\', \'domainname\' );

add_filter( \'request\', \'wpse4558_request\' );
function wpse4558_request( $query_vars )
{
    $query_vars[\'is_subdomain_request\'] = false;
    if ( WPSE4558_STANDARD_SERVER != $_SERVER[\'SERVER_NAME\'] ) {
        $query_vars[\'meta_key\'] = WPSE4558_META_KEY;
        // This can also be just the subdomain, if you edit it
        $query_vars[\'meta_value\'] = $_SERVER[\'SERVER_NAME\'];
        $query_vars[\'is_subdomain_request\'] = true;

    }
    return $query_vars;
}

add_action( \'parse_query\', \'wpse4558_parse_query\' );
function wpse4558_parse_query( &$wp_query )
{
    if ( $wp_query->get( \'is_subdomain_request\' ) ) {
        $wp_query->is_home = false;
        $wp_query->is_page = true;
        $wp_query->is_singular = true;
    }
}

add_filter( \'page_template\', \'wpse4558_page_template\' );
function wpse4558_page_template( $template )
{
    global $wp_query;
    $id = $wp_query->get_queried_object_id();
    if( ! $wp_query->get( \'is_subdomain_request\' ) && get_post_meta( $id, WPSE4558_META_KEY ) ) {
        // This is a page that has a subdomain attached, but the current request is not via that subdomain
        // So use the normal template hierarchy, ignore the page template
        $templates = array();
        $pagename = $wp_query->get_queried_object()->post_name;
        if ( $pagename ) {
            $templates[] = "page-$pagename.php";
        }
        if ( $id ) {
            $templates[] = "page-$id.php";
        }
        $templates[] = "page.php";
        $template = locate_template( $templates );
    }
    return $template;
}