使用数组通过php发送短信

Question

I have account on sms gateway and I want to send sms message using php language the information which I found in User Guide like this to send sms message I cane use this code and I can send message using it

 $xmlString='data=<BILGI>
 <KULLANICI_ADI>username</KULLANICI_ADI>
   <SIFRE>password</SIFRE>
  <BASLIK>subject</BASLIK> 
 </BILGI>
 <ISLEM>
 <YOLLA>
   <MESAJ>hello from NetCom   </MESAJ>
 <NO>xxxxxxxxx phone number</NO>
     </YOLLA>

  </ISLEM>';  

  //API URL
    $postUrl='http://www.toplusmsnet.com/services/api.php?islem=sms';

    $Veriler =  $xmlString;
   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $postUrl);
   curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $Veriler);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,0);
   curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    $response = curl_exec($ch);
   curl_close($ch);

I can send sms message using above code but I want to pass message's attribute using array like this

       $destination = array("messageId" => $messageId, 
        "to" => $to);
       $message = array("from" => $from,
      "destinations" => array($destination),
       "text" => $text,
       "notifyUrl" => $notifyUrl,
      "notifyContentType" => $notifyContentType,
       "callbackData" => $callbackData);

to make sms configuration more easy. how can I make information to be in array and send it using curl I wish I explained my problem correctly