simplexml_load_string返回没有标签的值

Question

我有xml文件，我正在用curl抓取它，然后得到

string(3781) "
     <?xml version="1.0" encoding="utf-8"?>

    <!--
        Generated by e-racuni.com

        Release number: 791.2
        Release date: 10.09.2019
        Request URL: /WebServicesHR/API
    -->

<response status="ok">
    <SalesInvoice>
        <advanceInvoicesRef></advanceInvoicesRef>
        <amountAlreadyPaid>-90</amountAlreadyPaid>
        <amountLeftToBePaid>0</amountLeftToBePaid>
        <bankAccountNumber>HR5623600001101883472</bankAccountNumber>
        <businessUnit>0000</businessUnit>
        <businessYear>2019</businessYear>
        <buyerCountry>HR</buyerCountry>
        <buyerName></buyerName>
        <buyerVatRegistration>Unknown</buyerVatRegistration>
        <city>Zagreb</city>
    </SalesInvoice>
</response>
"

我尝试使用simplexml_load_string，但是我只得到这样的值

object(SimpleXMLElement)#1 (1) { [0]=> string(2869) " -90 0 
HR5623600001101883472 0000 2019 HR Unknown Zagreb 

  $url = "http://www.elektroprofi.hr/api/demo.php";

  $ch = curl_init();
  curl_setopt($ch,CURLOPT_URL,$url);
  curl_setopt($ch,CURLOPT_FAILONERROR,1);
  curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);
  curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
  curl_setopt($ch,CURLOPT_TIMEOUT,3);
  $result = curl_exec($ch);
  curl_close($ch);
  $response = simplexml_load_string($result);

  var_dump($response);

如果有人可以帮助我，我会对此感到陌生，这真令人困惑，我希望得到类似[city] => zagreb，[date] => 2019-02-04