Hash / Object / Array to XML using XmlWriter

hash2xml.php

<?php
/**
 * User: evaisse
 * Date: 28/09/2016
 * Time: 12:45
 */

/**
 * @see https://dev.kafol.net/2008/09/php-xml-generator.html
 * Usage :
 *
 *      $xml = new XmlGenerator();
 *      echo $xml->generate('my-tag-name', $myData);
 *
 */
class XmlGenerator
{

    /**
     * @var XMLWriter
     */
    protected $xml;

    /**
     * @var string xml version string ("1.0")
     */
    protected $ver;

    /**
     * @var string $charset xml charset ("UTF-8")
     */
    protected $charset;

    /**
     * @param string $ver     xml version string ("1.0")
     * @param string $charset xml charset ("UTF-8")
     */
    function xmlgen($ver = '1.0', $charset = 'UTF-8')
    {
        $this->ver     = $ver;
        $this->charset = $charset;
    }

    /**
     * @param string       $root root tag name
     * @param array|object $data data to convert
     * @return string xml string
     */
    function generate($root, $data = array())
    {
        $this->xml = new XmlWriter();
        $this->xml->openMemory();
        $this->xml->startDocument($this->ver, $this->charset);
        $this->xml->startElement($root);
        $this->xml->setIndent(true);
        $this->xml->setIndentString('    ');
        $this->write($this->xml, $data);
        $this->xml->endElement();
        $this->xml->endDocument();
        $xml = $this->xml->outputMemory(true);
        $this->xml->flush();
        return $xml;
    }

    /**
     * @param XMLWriter    $xml  xml writer instance
     * @param array|object $data data to append to current writer
     */
    protected function write(XMLWriter $xml, $data)
    {
        foreach ($data as $key => $value) {
            if (is_integer($key) && (is_array($value) || is_object($value))) {
                $xml->startElement('item');
                $this->write($xml, $value);
                $xml->endElement();
            } else if (is_integer($key)) {
                $xml->writeElement("item$key", $value);
            } else if (is_array($value) || is_object($value)) {
                $xml->startElement($key);
                $this->write($xml, $value);
                $xml->endElement();
            } else {
                $xml->writeElement($key, $value);
            }
        }
    }

}