using curl to send xml

try using this function to send xml over POST (from http://stackoverflow.com/questions/238784/php4-send-xml-over-https-post-via-curl)

function sendXmlOverPost($url, $xml) {
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);

  // For xml, change the content-type.
  curl_setopt ($ch, CURLOPT_HTTPHEADER, Array("Content-Type: text/xml"));

  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);

  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // ask for results to be returned
  if(CurlHelper::checkHttpsURL($url)) { 
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
  }

  // Send to remote and return data to caller.
  $result = curl_exec($ch);
  curl_close($ch);
  return $result;
}

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i've tried something very much like this already (actually, this is why i was trying to use curl to debug).

PARTIAL ANSWER:
i used ideas from the google checkout/shopping cart class.

using your fcn and the value of $inpXML set to
  <?xml version=\"1.0\" encoding=\"utf-8\"?><outer><inner1>hello</inner1><inner2>world</inner2></outer>

i get this response:

  soap:VersionMismatchPossible SOAP version mismatch: Envelope namespace was
  unexpected. Expecting http://schemas.xmlsoap.org/soap/envelope/.

instead of the response indicated in my orig post.  i massaged my code
around until i got the same response.  the diff is, i was using this
  $postData = array('inpXML' => $inpXML);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);

instead of your version, this:
  curl_setopt($ch, CURLOPT_POSTFIELDS, $inpXML);

the php documentation sez,
CURLOPT_POSTFIELDS         ... or as an array with the field name
                         as key and field data as value.         

and the example code in the php doc illustrates this:
  $data = array('name' => 'Foo', 'file' => '@/home/user/test.png');
  curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

not sure whats up with that....

furthermore, the vendor page says the http post format should be:

  POST /service1.asmx/ProcessXML HTTP/1.1
  Host: srvtest.myVendorDomain.com
  Content-Type: application/x-www-form-urlencoded
  Content-Length: length
 
  inpXML=string

this seems to indicate they're looking for something that looks like
a submitted form with the form field id set to "inpXML", and the field value of
urlencode($xmlString)

when i curl the exact same string using
  curl -d "inpXML='string'" url/script.asmx
    or
  curl -d "inpXML=urlencode('string')" url/script.asmx
    or
  curl -d "inpXML=urlencode('string')" -H "Content-Type: application/x-www-form-urlencoded" url/script.asmx
    or
  curl -d "inpXML='string'" -H "Content-Type: text/xml" url/script.asmx

(where urlencoded('string') means the encoded version of the string)

i still get a soap response of
  Data at the root level is invalid. Line 1, position 1.


=======================
all of these,
  curl_setopt ($ch, CURLOPT_HTTPHEADER, Array("Content-Type: text/xml"));
  or
  curl_setopt ($ch, CURLOPT_HTTPHEADER, Array("Content-Type: application/x-www-form-urlencoded"));

used with
  curl_setopt($ch, CURLOPT_POSTFIELDS, $inpXML);

produce

  soap:VersionMismatchPossible SOAP version mismatch: Envelope namespace was unexpected. Expecting http://schemas.xmlsoap.org/soap/envelope/.

=======================
changing to either
  curl_setopt($ch, CURLOPT_POSTFIELDS, urlencode('inpXML=' . $inpXML));
  or
  curl_setopt($ch, CURLOPT_POSTFIELDS, array('inpXML' => $inpXML));
 
produces
  soap:ReceiverServer was unable to process request. ---> Data at the root level is invalid. Line 1, position 1.
=======================



a couple questions:
is this the CurlHelper class from the google facebook code?
why is the response a soap msg?
why is soap involved?  do i need a soap namespace?  (maybe i'll try that next)

and finally, what is the curl syntax to get the same behavior as your fcn?

thanks