Results of the tests and object dumps are here:
http://intranet.grupos.com.br/~sabrina/phpbug

Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc. If the script requires a 
database to demonstrate the issue, please make sure it creates 
all necessary tables, stored procedures etc.

Please avoid embedding huge scripts into the report.

<?

$proxyParams = array('soap_version' => SOAP_1_1, 'trace' => false, 'exceptions' => true, 'encoding' => 'ISO-8859-1', 'location' => $newIp );
try {
	$SOAPObject = new SoapClient('http://enturma.com.br/wsdl/session.wsdl', $proxyParams);
} catch (SoapFault $e) {
	throw new ESoapException($e->faultcode, $e->faultstring, 'initSOAP', $this->componentName, false);
}

$return = $SOAPObject->__soapCall('getClientInfoFromDomain', 'sabrina.corp.grupos.com.br');
		
var_dump($return);

/** Var_dump for 5.1.5 can be seen here: http://intranet.grupos.com.br/~sabrina/phpbug/phpreply515.html
    Var_dump for 5.1.4 can be seen here: http://intranet.grupos.com.br/~sabrina/phpbug/phpreply514.html

**/
?>

Notice: Undefined variable: newIp in /tmp/1.php on line 4

Warning: SoapClient::__soapCall() expects parameter 2 to be array, string given in /tmp/1.php on line 14

Fatal error: SoapClient::__soapCall(): Invalid parameters in /tmp/1.php on line 14

unfortunately, you cannot execute this code as it is, because the webservice in question is private and cannot be accessed externarly or without authentication.

the line:
$return = $SOAPObject->__soapCall('getClientInfoFromDomain',
'sabrina.corp.grupos.com.br');
is incorrect, and should be:
$return = $SOAPObject->__soapCall('getClientInfoFromDomain',
array('sabrina.corp.grupos.com.br'));

but other than that, you could either try to access a webservice that returns an array of objects or read the
the result dumps of this script for versions 5.1.4 and 5.1.5 
(you can check these files 
http://intranet.grupos.com.br/~sabrina/phpbug/phpreply515.html
http://intranet.grupos.com.br/~sabrina/phpbug/phpreply514.html
) and see that there is a big difference between both responses.

thank you for your replies.

We still need a short reproduce script without private services and fatal errors.

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

reopen

More info...

-- soap client php --
<?php
$arr = array('soap_version'=>SOAP_1_1, 'exceptions'=>true, 'trace'=>1, 'encoding'=>'ISO-8859-1', 'location'=>'http://corp.grupos.com.br:1028');
$SOAPObject = new SoapClient('session.wsdl', $arr);
var_dump($SOAPObject->__soapCall('getClientInfoFromDomain', array('sabrina.corp.grupos.com.br')));
?>
--

Soap server reply:

http://intranet.grupos.com.br/~marcus/soaptest/soapserver.output

WSDL:

http://intranet.grupos.com.br/~marcus/soaptest/session.wsdl

Actual result:

http://intranet.grupos.com.br/~marcus/soaptest/actual.result

Expected result:

http://intranet.grupos.com.br/~marcus/soaptest/expected.result

Fixed in CVS HEAD and PHP_5_2.