Pear:soap

hi
when I am trying to send up a wsdl request using pear soapClient.php

I get an error that means that he didnt recognize
$sDomainArray
any help will be vey appreciated since that cost me half a day
already I believe that the problem is in define the type for the request
Regards

my code is this
[php]
require_once 'SOAP/Client.php';
$wsdl_url = "(*********)";
$api = new SOAP_WSDL($wsdl_url);
/* echo ( $api->generateProxyCode() ); */
$client = $api->getProxy();
$user="251263";
$pass="password";
$sCLTRID= md5(uniqid(rand(),true));
$credential = array("Account" => $user, "Password" => $pass);
$sDomainArray = array("1"=>"example.us","2"=>"example.biz");[/highlight]
print_r($sDomainArray);
$sHostArray=null;
$sNSArray=null;
$result = $client->checkAvailability($sCLTRID,$credential,$sDomainArr ay,NULL,NULL);
echo $result;
[php]
and the soap request is
[wsdl]
POST /wswwdapi/wapi.asmx HTTP/1.1
Host: *********
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "*********/webservices/CheckAvailability"

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlnssi="*******" xmlnssd="*******" xmlns:soap="********">
<soap:Body>
<CheckAvailability xmlns="*******/webservices/">
<sCLTRID>string</sCLTRID>
<credential>
<Account>string</Account>
<Password>string</Password>
</credential>
<sDomainArray>
<string>string</string>
<string>string</string>
</sDomainArray>
<sHostArray>
<string>string</string>
<string>string</string>
</sHostArray>
<sNSArray>
<string>string</string>
<string>string</string>
</sNSArray>
</CheckAvailability>
</soap:Body>
</soap:Envelope>
[wsdl]

I'm trying to impalement the same API and this same issue has me stomped, have you been able to find a solution?