PHP SoapClient: Object of class stdClass could not be converted to string - php

Question

I'm making what's likely to be a really simple mistake but can't seem to work out. I'm attempting to send a SOAP request to a web service using the PHP SoapClient library. The following error occurs when attempting to print:
"Object of class stdClass could not be converted to string"
Here is the code, taken primarily from the PHP SoapClient Manual.
<?php
try {
$options = array(
'soap_version'=>SOAP_1_2,
'exceptions'=>true,
'trace'=>1,
'cache_wsdl'=>WSDL_CACHE_NONE
);
$client = new SoapClient('http://www.webservicex.net/ConvertTemperature.asmx?WSDL', $options);
$results = $client->ConvertTemp(array('Temperature'=>'100', 'FromUnit' => 'degreeCelsius',
'ToUnit' => 'degreeFahrenheit'));
}
catch (Exception $e)
{
echo "<h2>Exception Error!</h2>";
echo $e->getMessage();
}
$results = $client->ConvertTemp(array('Temperature'=>'100', 'FromUnit' => 'degreeCelsius',
'ToUnit' => 'degreeFahrenheit'));
print $results;
?>
I understand that the message is telling me that I'm trying to print an entire object rather than a member of that object. What I don't understand is that I'm expecting a call to ConvertTemp to return a string. Why is an object being return? Thanks in advance for any help.

Answer 1

Well, your expectations may be wrong. A var_dump or print_r can shed light on what $results actually is, re-examing the wsdl could tell you why:
Hint: __getTypes():
struct ConvertTempResponse {
double ConvertTempResult;
}