if clauses not working in laravel 5.3 mailable - email

Question

in Laravel 5.1 I sent message like this. So user could send message with or without attachment.
Mail::send('emails.contacts', $mailarray, function($message) use ($mailarray) {
$message->from($mailarray['email'], $mailarray['name'] );
$message->to('admin#site.ru', 'admin');
$message->setCc($mailarray['email'], $mailarray['name']);
$message->replyTo($mailarray['email'], $mailarray['name'] );
$message->subject('Письмо со страницы Контакты');
if ( isset($mailarray['attachment']) )
{
$message->attach($mailarray['attachment']->getRealPath(), array(
'as' => $mailarray['attachment']->getClientOriginalName(),
'mime' => $mailarray['attachment']->getMimeType()));
}
});
This approach is not working with Mailable. Doing this I get error
syntax error, unexpected 'if' (T_IF)
And it is working only like this, which is duplicating code a lot.
public function build()
{
if (is_null($this->file) ) {
return $this->subject('Обратный звонок с сайта')
->view('emails.callback')
->cc($this->input['email'], $this->input['name'])
->replyTo($this->input['email'], $this->input['name']);
}
else {
return $this->subject('Обратный звонок с сайта')
->view('emails.callback')
->cc($this->input['email'], $this->input['name'])
->replyTo($this->input['email'], $this->input['name'])
->attach($this->file, array('as' => $this->file->getClientOriginalName(), 'mime' => $this->file->getClientMimeType() ));
}
}