stdClass Object
    (
        [errors] => Array
            (
                [0] => stdClass Object
                    (
                        [fields] => Array
                            (
                                [0] => ShippingStreet
                            )

                        [message] => Please enter the FULL Shipping Address for this Account
                        [statusCode] => FIELD_CUSTOM_VALIDATION_EXCEPTION
                    )

            )

        [id] =>
        [success] =>
    )

SoapFault Object
(
    [message:protected] => INVALID_FIELD: No such column 'ShippingStreet' on     entity 'Opportunity'. If you are attempting to use a custom field, be sure to   append the '__c' after the custom field name. Please reference your WSDL or the  describe call for the appropriate names.
[string:Exception:private] =>
[code:protected] => 0
[file:protected] =>    C:wampwwwcheckoutsalesforcesoapclientSforceBaseClient.php
[line:protected] => 514
[trace:Exception:private] => Array
    (
        [0] => Array
            (
                [file] => C:wampwwwcheckoutsalesforcesoapclientSforceBaseClient.php
                [line] => 514
                [function] => __call
                [class] => SoapClient
                [type] => ->
                [args] => Array
                    (
                        [0] => update
                        [1] => Array
                            (
                                [0] => stdClass Object
                                    (
                                        [sObjects] => Array
                                            (
                                                [0] => SoapVar Object
                                                    (
                                                        [enc_type] => 301
                                                        [enc_value] => stdClass Object
                                                            (
                                                                [Id] => xxxxREMOVED_IDxxxxxx
                                                                [StageName] => Closed Won
                                                                [CloseDate] => 2016-01-08
                                                                [LeadSource] => Self-Service
                                                                [Type] => New Business
                                                                [Amount] => 6000
                                                                [ShippingStreet] => 123 Test St
                                                            )

                                                        [enc_stype] => Opportunity
                                                        [enc_ns] => urn:enterprise.soap.sforce.com
                                                    )

                                            )

                                    )

                            )

                    )

            )

define("SOAP_CLIENT_BASEDIR", "salesforce/soapclient");
require_once (SOAP_CLIENT_BASEDIR.'/SforceEnterpriseClient.php');
require_once (SOAP_CLIENT_BASEDIR.'/SforceHeaderOptions.php');


        $USERNAME="xxxxxxx";
        $PASSWORD="xxxxxxxxxxxxxxxxxxxxxxxxxxx";

 $sObject = new stdClass();
 $sObject->Id = $_SESSION['user']['sf_opportunityID'];
 //$sObject->AccountId = $_SESSION['user']['sf_accountID']; tried with and without this
 $sObject->StageName = 'Closed Won';
 $sObject->CloseDate = date('Y-m-d');
 $sObject->LeadSource = 'Self-Service';
 $sObject->Type = 'New Business';
 $sObject->Amount = 6000;
 $sObject->ShippingStreet = '123 Test St';
 $opportunityUpdateArray = array($sObject);


try {
    $mySforceConnection = new SforceEnterpriseClient();

    $mySoapClient = $mySforceConnection->createConnection(SOAP_CLIENT_BASEDIR.'/enterprise.wsdl.xml');
    $mylogin = $mySforceConnection->login($USERNAME, $PASSWORD);

    $updateOpportunityResponse = $mySforceConnection->update($opportunityUpdateArray, 'Opportunity');

}catch (Exception $e) {
    echo $e->faultstring;
        }