我通过将下面的代码放入插件中解决了这个问题。

class My_Class {

    public static function go_to_login() {
        global $pagenow, $theme_my_login, $redirect_to;

        if ( \'wp-login.php\' == $pagenow ) {
            $url = ( false === strpos( $redirect_to, \'wp-admin\' ) ? $redirect_to : site_url() );
            wp_redirect( \'http://www.example.com/login?to=\' . urlencode( $url ) );
            exit;
        }
    }

}

add_action( \'login_head\', \'My_Class::go_to_login\' );