如何使用Laravel在内容中发送邮件动态参数电子邮件？

Question

           $url_str = $request->account_name . ".hello.com/";

           $objDemo = new \stdClass();
           $objDemo->firstname = $request->first_name;
           $objDemo->account_name = $request->account_name;
           $objDemo->title = 'Registration Information';
           $objDemo->username = $request->username;
           $objDemo->password = $password;
           $objDemo->url = URL('/');

           $objTmp = new \stdClass();
           $objTmp->firstname = $request->first_name;
           $objTmp->account_name = $request->account_name;
           $objTmp->title = 'Booking Registration Information';
           $objTmp->username = $request->username;
           $objTmp->password = $password;
           $objTmp->url = $url_str;

           Mail::to($request->email)->send(new BookingRegistration($objTmp));
           Mail::to($request->email)->send(new AccountRegistration($objDemo));

我已经在Laravel中创建了发送邮件。在objDemo上运行良好。但是对于ObjTmp无法正常工作，也许参数$ url_str带有任何“”。价值使之无法运作。