commonWebservice/app/common/array2xml.php

<?php
namespace app\common;



class array2xml {
    private $version = '1.0';
    private $encoding = 'UTF-8';
    private $xml  = null;
    function __construct() {
        $this->xml = new \XMLWriter();
    }
    public function toXml($data, $eIsArray=FALSE) {
        if(!$eIsArray) {
            $this->xml->openMemory();
            $this->xml->startDocument($this->version, $this->encoding);
        }
        foreach($data as $key => $value){

            if(is_array($value)){
                $this->xml->startElement($key);
                $this->toXml($value, TRUE);
                $this->xml->endElement();
                continue;
            }
            $this->xml->writeElement($key, $value);
        }
      if(!$eIsArray) {
          $this->xml->endElement();
          return $this->xml->outputMemory(true);
      }
    }
}