PHP SOAP Client to API

$URL = 'http://www.reefservices.co.uk/leadws/lead.asmx';

    function createRequestXML($params = array()) {
        $DealerCode = (array_key_exists('DealerCode',$params)) ? $params['DealerCode'] : 123456; // required
        $LeadType = (array_key_exists('LeadType',$params)) ? $params['LeadType'] : 'Used Car Enquiry'; // required
        $LeadSource = (array_key_exists('LeadSource',$params)) ? $params['LeadSource'] : 'Website'; // required
        $LeadId = (array_key_exists('LeadId',$params)) ? $params['LeadId'] : '123456'; // not required
        $CustomerType = (array_key_exists('CustomerType',$params)) ? $params['CustomerType'] : 1; // required. can be : 0 for Company, 1 for Individual
        $Title = (array_key_exists('Title',$params)) ? $params['Title'] : 'Master'; // not required
        $Forename = (array_key_exists('Forename',$params)) ? $params['Forename'] : 'Test'; // required
        $Lastname = (array_key_exists('Lastname',$params)) ? $params['Lastname'] : 'Name'; // required
        $Companyname = (array_key_exists('Companyname',$params)) ? $params['Companyname'] : 'Company'; // not required

        /* One of the following fields is required to have a value */
        $Homephone = (array_key_exists('Homephone',$params)) ? $params['Homephone'] : '0123456789';
        $Workphone = (array_key_exists('Workphone',$params)) ? $params['Workphone'] : '0123456789';
        $Mobilephone = (array_key_exists('Mobilephone',$params)) ? $params['Mobilephone'] : '0123456789';
        $Email = (array_key_exists('Email',$params)) ? $params['Email'] : 'test@test.co.uk';
        /* One of the above fields is required to have a value */

        $Address1 = (array_key_exists('Address1',$params)) ? $params['Address1'] : 'AAAAAA'; // not required
        $Address2 = (array_key_exists('Address2',$params)) ? $params['Address2'] : 'BBBBBB'; // not required
        $City = (array_key_exists('City',$params)) ? $params['City'] : 'CCCCCCC'; // not required
        $County = (array_key_exists('County',$params)) ? $params['County'] : 'DDDDDDDD'; // not required
        $Postcode = (array_key_exists('Postcode',$params)) ? $params['Postcode'] : 'EEEEE'; // not required

        $dpapostal = (array_key_exists('dpapostal',$params)) ? $params['dpapostal'] : 'Y'; // required. can be Y/N
        $dpasms = (array_key_exists('dpasms',$params)) ? $params['dpasms'] : 'Y'; // required. can be Y/N
        $dpstel = (array_key_exists('dpstel',$params)) ? $params['dpstel'] : 'Y'; // required. can be Y/N
        $dpaemail = (array_key_exists('dpaemail',$params)) ? $params['dpaemail'] : 'Y'; // required. can be Y/N

        $Methodofcontact = (array_key_exists('Methodofcontact',$params)) ? $params['Methodofcontact'] : 'Internet'; // not required
        $Sourceofenquiry = (array_key_exists('Sourceofenquiry',$params)) ? $params['Sourceofenquiry'] : 'Autotrader'; // not required

        $Message = (array_key_exists('Message',$params)) ? $params['Message'] : 'I would like to buy a car please.'; // not required

        $Regno = (array_key_exists('Regno',$params)) ? $params['Regno'] : 'R33FBS'; // not required
        $Newused = (array_key_exists('Newused',$params)) ? $params['Newused'] : 'USED'; // not required. can be "NEW"/"USED"
        $Make = (array_key_exists('Make',$params)) ? $params['Make'] : 'BMW'; // not required
        $Model = (array_key_exists('Model',$params)) ? $params['Model'] : '3 Series'; // not required
        $Derivative = (array_key_exists('Derivative',$params)) ? $params['Derivative'] : '330D Coupe'; // not required
        $Fuel = (array_key_exists('Fuel',$params)) ? $params['Fuel'] : 'Diesel'; // not required
        $Colour = (array_key_exists('Colour',$params)) ? $params['Colour'] : 'Silver'; // not required

        $PartEx_Regno = (array_key_exists('PartEx_Regno',$params)) ? $params['PartEx_Regno'] : 'N476AKV'; // not required
        $PartEx_Mileage = (array_key_exists('PartEx_Mileage',$params)) ? $params['PartEx_Mileage'] : '45600'; // not required

        $xml = '    <?xml version="1.0" encoding="UTF-8" ?>
                    <SecurityInfo>
                        <Username>'.REEF_USERNAME.'</Username>
                        <Password>'.REEF_PASSWORD.'</Password>
                    </SecurityInfo>
                    <Lead>
                        <DealerCode>'.$DealerCode.'</DealerCode>
                        <LeadType>'.$LeadType.'</LeadType>
                        <LeadSource>'.$LeadSource.'</LeadSource>
                        <LeadId>'.$LeadId.'</LeadId>
                        <Customer>
                            <CustomerType>'.$CustomerType.'</CustomerType>
                            <Title>'.$Title.'</Title>
                            <Forename>'.$Forename.'</Forename>
                            <Lastname>'.$Lastname.'</Lastname>
                            <Companyname>'.$Companyname.'</Companyname>
                            <Homephone>'.$Homephone.'</Homephone>
                            <Workphone>'.$Workphone.'</Workphone>
                            <Mobilephone>'.$Mobilephone.'</Mobilephone>
                            <Email>'.$Email.'</Email>
                            <Address>
                                <Address1>'.$Address1.'</Address1>
                                <Address2>'.$Address2.'</Address2>
                                <City>'.$City.'</City>
                                <County>'.$County.'</County>
                                <Postcode>'.$Postcode.'</Postcode>
                            </Address>
                            <Dpa>
                                <dpapostal>'.$dpapostal.'</dpapostal>
                                <dpasms>'.$dpasms.'</dpasms>
                                <dpstel>'.$dpstel.'</dpstel>
                                <dpaemail>'.$dpaemail.'</dpaemail>
                            </Dpa>
                            <Marketing>
                                <Methodofcontact>'.$Methodofcontact.'</Methodofcontact>
                                <Sourceofenquiry>'.$Sourceofenquiry.'</Sourceofenquiry>
                            </Marketing>
                            <Message>'.$Message.'</Message>
                        </Customer>
                        <Vehicle>
                            <Regno>'.$Regno.'</Regno>
                            <Newused>'.$Newused.'</Newused>
                            <Make>'.$Make.'</Make>
                            <Model>'.$Model.'</Model>
                            <Derivative>'.$Derivative.'</Derivative>
                            <Fuel>'.$Fuel.'</Fuel>
                            <Colour>'.$Colour.'</Colour>
                        </Vehicle>
                        <PartEx>
                            <Regno>'.$PartEx_Regno.'</Regno>
                            <Mileage>'.$PartEx_Mileage.'</Mileage>
                        </PartEx>
                    </Lead>';

        return str_replace("\n","",$xml);
    }

    $send = createRequestXML(array(
        'DealerCode' => 123456,
        'Title' => 'Mr',
        'Companyname' => 'Reef',
        'Email' => 'test@test.com',
        'Methodofcontact' => 'Internet',
        'Sourceofenquiry' => 'Stackoverflow',
        'Message' => 'I would like to buy a car',
        'Newused' => 'USED',
        'Make' => 'BMW',
        'Model' => '3 Series',
        'Derivative' => '330D Coupe',
        'Fuel' => 'Diesel',
        'Colour' => 'Silver',
        'PartEx_Mileage' => '45600'
    ));

try {
        $client = new SoapClient("http://www.reefservices.co.uk/leadws/lead.asmx?WSDL",array(
            'location'      => $URL,
            'uri'           => "http://www.reefservices.co.uk/leadws/",
            'trace'         => 1,
            'exceptions'    => true
        ));

        $return = $client->Submit(array('Data' => $send));

$the_xml = str_replace("\n",'',rtrim($return->SubmitResult,','));

        preg_match_all("/<SUMMARY[^>]*>(.*?)<\/SUMMARY>/si", $the_xml, $summary, PREG_PATTERN_ORDER);
        preg_match_all("/<LEADID[^>]*>(.*?)<\/LEADID>/si", $the_xml, $lead, PREG_PATTERN_ORDER);
        preg_match_all("/<REEFID[^>]*>(.*?)<\/REEFID>/si", $the_xml, $ref, PREG_PATTERN_ORDER);

        $entries = array();
        if(count($lead) == count($ref)) {
            foreach($lead[1] AS $key => $value) {
                $entries[$key] = array(
                    'lead' => trim($value),
                    'ref' => trim($ref[1][$key])
                );
            }
        }

        $final = array(
            'summary' => $summary[1],
            'leads' => $entries
        );

        echo '<pre>';
        print_r($final);
        echo '</pre>';
    } catch(SoapFault $e) {
        echo '<h3>Exception</h3>';
        echo '<pre>';
        print_r($e);
        echo '</pre>';
    }
?>