PHP Get values from Fields

Hello,
Below is my code I am using from a Gateway for sending SMS.

I have 2 felds Dst_nbr and Message, Now the problem is that how can I get values from fields (Dst_nbr and Message) into the values of <Dst_nbr> and <Message> of the code which you can see below.

Currently you can see that the Destination Number code value is 923665487745 and Message is “A task is due, Please check your email or Login into the Dashboard.”.

I want it to get the values from the fields of Dst_nbr and Message, So that it can change accordingly to the data entered or available in the fields.

<?php
set_time_limit(0);
//URL to call
define(‘ZONG_DOMAIN_URL’, “http://115.186.182.11/CSWS/Service.asmx?wsdl“);
$post_data='<?xml version=”1.0″ encoding=”utf-8″?>
<soap12:Envelope xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xmlns:xsd=”http://www.w3.org/2001/XMLSchema” xmlns:soap12=”http://www.w3.org/2003/05/soap-envelope“>
<soap12:Body>
<SendSMS xmlns=”http://tempuri.org/“>
<Src_nbr>923189377654</Src_nbr>
<Password>mikeishere</Password>
<Dst_nbr>923665487745</Dst_nbr>
<Mask>STAFF</Mask>
<Message>”A task is due, Please check your email or Login into the Dashboard.”</Message>
<TransactionID>’.rand().'</TransactionID>
</SendSMS>
</soap12:Body>
</soap12:Envelope>’;

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, ZONG_DOMAIN_URL );
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
curl_setopt($ch, CURLOPT_POST, 1 );
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data );
curl_setopt($ch, CURLOPT_HTTPHEADER, array(‘Content-Type: application/soap+xml’, ‘charset=utf-8’));
echo $result = curl_exec ($ch);

?>

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