Simple example for php

simpleexample.php

<?php
$url = "http://sms3.pswin.com/sms";

$doc = <<<XML
<?xml version="1.0"?>
<SESSION>
  <CLIENT>myusername</CLIENT>
  <PW>mypassword</PW>
  <MSGLST>
    <MSG>
      <TEXT>Test message</TEXT>
      <RCV>4799999999</RCV>
    </MSG>
  </MSGLST>
</SESSION>
XML;

$params = array('http' => array(
    'method' => 'POST',
    'header'=> "Content-type: application/x-www-form-urlencoded\r\n" . "Content-Length: " . strlen($doc) . "\r\n",
    'content' => $doc
));
            
$ctx = stream_context_create($params);
$fp = @fopen($url, 'rb', false, $ctx);
$response = @stream_get_contents($fp);
?>