Super simple class to encode an object into XML.

simple_xml_encode.php

<?php
class XML {

  /**
   * Encode an object as XML string
   *
   * @param Object $obj
   * @param string $root_node
   * @return string $xml
   */
  public function encodeObj($obj, $root_node = 'response') {
    $xml = '<?xml version="1.0" encoding="utf-8"?>' . PHP_EOL;
    $xml .= self::encode($obj, $root_node, $depth = 0);
    return $xml;
  }


  /**
   * Encode an object as XML string
   *
   * @param Object|array $data
   * @param string $root_node
   * @param int $depth Used for indentation
   * @return string $xml
   */
  private function encode($data, $node, $depth) {
    $xml = str_repeat("\t", $depth);
    $xml .= "<{$node}>" . PHP_EOL;
    foreach($data as $key => $val) {
      if(is_array($val) || is_object($val)) {
        $xml .= self::encode($val, $key, ($depth + 1));
      } else {
        $xml .= str_repeat("\t", ($depth + 1));
        $xml .= "<{$key}>" . htmlspecialchars($val) . "</{$key}>" . PHP_EOL;
      }
    }
    $xml .= str_repeat("\t", $depth);
    $xml .= "</{$node}>" . PHP_EOL;
    return $xml;
  }
}