Wrapping XML for SOAP request

I am having trouble in wrapping multi dimensional XML data to array in PHP to send to SOAP server

<soapenv:Body>
      <ezit:AddClientSitesEx>

         <ezit:ID>hello</ezit:ID>
         <ezit:Password>pass</ezit:Password>
         <ezit:ClientData>
         <![CDATA[
         <clientsitelistex>
            <clientsite>
                <id>1</id>
                <callerid>6475710001|6475710002</callerid>
                <status>ACTIVE</status>
                <reference>SITE01_M4158</reference>
                <sitename>ADAMS Huriata</sitename>
                <managerref>MGR2023</managerref>
                <pbxsite>false</pbxsite>
                <parentsiteref/>
                <sitegroup>Residential</sitegroup>
                <costcode>5</costcode>
                <minstaff>1</minstaff>
                <alarmtimeon>22:00</alarmtimeon>
                <alarmtimeoff>08:00</alarmtimeoff>
                <visitduration>60</visitduration>
                <externalref>SiteUpload1</externalref>
                <failifexists>true</failifexists>
                <address>Flat 26/7 Kevale Place</address>
                <city>Auckland</city>
                <state>AKL</state>
                <postalcode>2102</postalcode>
                <country>NZ</country>
                <address2>Manurewa</address2>
                <sitetags>Elderly|High-Risk</sitetags>
                <keyholdername>Huriata ADAMS</keyholdername>
                <keyholdernumber>64992660051</keyholdernumber>
                <emergencyname>Ms H Hura</emergencyname>
                <emergencynumber>642102718141</emergencynumber>
                <custom1>Custom Field 1</custom1>
                <custom2>Custom Field 2</custom2>
                <telephonenotavailable>false</telephonenotavailable>
                <alertemail>true</alertemail>
                <alertsms>false</alertsms>
                <alertvoice>false</alertvoice>
                <idnumber>239857</idnumber>
             </clientsite>

             <clientsite>
                <id>2</id>
                <reference>SITE02</reference>
                <managerref>MGR2023</managerref>
             </clientsite>

             <clientsite>
                <id>3</id>
                <reference>SITE02</reference>
                <managerref>MGR2023</managerref>
                <newreference>SITE03</newreference>
             </clientsite>

             <clientsite>
                <id>4</id>
                <status>DELETE</status>
                <reference>SITE03</reference>
             </clientsite>



             <!-- end -->
         </clientsitelistex>
         ]]>
         </ezit:ClientData>

         <ezit:ExternalRef>ExampleData</ezit:ExternalRef>

         <ezit:Test>false</ezit:Test>
      </ezit:AddClientSitesEx>
   </soapenv:Body>

The code that I have written is this

$url        =  "http://ift.tt/16sHJCA";
$options    =   array("soap_version" => SOAP_1_1,"trace" => 1);

$client = new SoapClient($url, $options);

$xml_params = array ('clientsitelistex'=>array(
  'clientsite' => array(
  'id' => "1",
  'callerid' => "6475710001|6475710002",
  'status' => "ACTIVE",
  'reference' => "SITE01_M4158",
  'sitename' => 'ADAMS Huriata',
  'managerref' => "MGR2023",
  'pbxsite' => false,
  'sitegroup' => "Residential",
  'costcode' => "5",
  'minstaff' => "1",
  'alarmtimeon' => "22:00",
  'alarmtimeoff' => "08:00",
  'visitduration' => "60",
  'externalref' => "SiteUpload1",
  'failifexists' => true,
  'address' => "Flat 26/7 Kevale Place",
  'city' => "Auckland",
  'state' => "AKL",
  'postalcode' => "2102",
  'country' => "NZ",
  'address2' => "Manurewa",
  'sitetags' => "Elderly|High-Risk",
  'keyholdername' => "Huriata ADAMS",
  'keyholdernumber' => "64992660051",
  'emergencyname' => "Ms H Hura",
  'emergencynumber' => "642102718141",
  'custom1' => "Custom Field 1",
  'custom2' => "Custom Field 2",
  'telephonenotavailable' => false,
  'alertemail' => true,
  'alertsms' => false,
  'alertvoice' => false,
  'idnumber' => "239857"
   )
  )
);


//Add xml parameters here
$user_param = array (
  'ID' => "hello",
  'Password' => "pass",
  array('ClientData' => $xml_params),
  'ExternalRef' => "1234",
  'Test' => 'False'
);

$result = $client->AddClientSitesEx($user_param);

It gives me

<results>
  <resultsummary>
    <result>ERROR</result>
    <lasterrtype>BadXML</lasterrtype>
    <lasterrtypevalue>3</lasterrtypevalue>
    <errordesc>Error transforming batch data to xml. Data at the root level is invalid. Line 1, position 1.</errordesc>
    <batchid>00c7a342-ff16-4139-b8f9-4ca9ae7e2371</batchid>
    <externalref>1234</externalref>
    <status>Start</status>
    <statusvalue>1</statusvalue>
    <totalrows>0</totalrows>
    <invalidrows>0</invalidrows>
    <validrows>0</validrows>
    <unprocessedrows>0</unprocessedrows>
  </resultsummary>
</results>

And when I do htmlentities($client->__getLastRequest()) It shows me that "Array" in Client Data

<soap-env:envelope xmlns:soap-env="http://ift.tt/sVJIaE" xmlns:ns1="http://example.com/abc/">
   <soap-env:body>
     <ns1:addclientsitesex>
       <ns1:id>hello</ns1:id>
       <ns1:password>pass</ns1:password>
       <ns1:clientdata>Array</ns1:clientdata>
       <ns1:externalref>1234</ns1:externalref>
       <ns1:test>true</ns1:test>
     </ns1:addclientsitesex>
   </soap-env:body>
 </soap-env:envelope>

Can anyone help how can I wrap client data

Thank You,