send_receive.php

<?php
echo 'PHP POST Request <br/>';

function curl_data($data) {
   // make sure curl module is enable
   // phpinfo();
   try {
       $ch = curl_init();
       curl_setopt($ch, CURLOPT_URL, 'http://localhost/xml_action/index.php'); // Response URL
       curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: text/xml") );
       curl_setopt($ch, CURLOPT_POST, true);
       curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
       $response = curl_exec($ch);

       if( $response === false ) throw new Exception(curl_error($ch), curl_errno($ch));

       curl_close($ch);
   } catch (Exception $e) {
       $response = 'Curl failed with error ' . $e->getCode() . ' ' . $e->getMessage();
   }
   return $response;
}

$xml = file_get_contents('send_data.xml'); // for file_get_contents make sure that php.ini necessary module is enable
$return_data = curl_data( $xml );
$obj_info = simplexml_load_string($return_data);

echo '<pre>';
print_r( $obj_info );
echo '</pre>';

// Save XML
$dom = new DOMDocument();
$dom->encoding = 'utf-8';
$dom->xmlVersion = '1.0';
$dom->formatOutput = true;
$root = $dom->createElement('information');
foreach( $obj_info as $key => $value ){
   $child_node = $dom->createElement($key, $value );
   $root->appendChild($child_node);
}
$dom->appendChild($root);
$dom->save('save_info.xml');