Append XML File

feed.php

<?php 
// format xml
/*
  <products>
    <product>
      ....
      ....
    <product>
  </products>
*/

$xmlFile = '/path/to/xml/file.xml'; // url or path
$doc = new \DOMDocument('1.0', 'utf-8');
$doc->formatOutput = true;
$doc->load($xmlFile);
$fragment = $doc->createDocumentFragment();
$elementChild = <<<elementChild
      <product>
          <name>WINSTON SMITH</name>
          <producturl>http://www.example.com/product/wanita/sepatu/natalia-lace-up-flats</producturl>
          <price>50000</price>
          <discount>0</discount>
          <description>
            Winston Smith Lady posses the concept of beauty, simplicity, style and comfort to produce premium quality shoes. Their are aiming to share their vision for comfortable, smart-casualshoes at pocket friendly prices. Natalia is a lace flat shoes made of 100% high quality leather. It's a versatile pair that you can wear with any outfit.
          </description>
          <instock>8</instock>
          <categotyid1>shop</categotyid1>
          <categotyid2>directory</categotyid2>
          <categotyid3>brands</categotyid3>
      </product>
elementChild;
  
  $fragment->appendXML($elementChild);
  $doc->documentElement->appendChild($fragment);
  //echo $doc->saveXML(); // dump
  $doc->save($xmlFile);// Save as xml file
  exit;