Xml.php

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<?php
#require_once 'Zend/Config/Writer/FileAbstract.php';

#require_once 'Zend/Config/Xml.php';

class Zend_Config_Writer_Xml extends Zend_Config_Writer_FileAbstract
{
    public function render()
    {
        $xml         = new SimpleXMLElement('<zend-config xmlns:zf="' . Zend_Config_Xml::XML_NAMESPACE . '"/>');
        $extends     = $this->_config->getExtends();
        $sectionName = $this->_config->getSectionName();

        if (is_string($sectionName)) {
            $child = $xml->addChild($sectionName);

            $this->_addBranch($this->_config, $child, $xml);
        } else {
            foreach ($this->_config as $sectionName => $data) {
                if (!($data instanceof Zend_Config)) {
                    $xml->addChild($sectionName, (string) $data);
                } else {
                    $child = $xml->addChild($sectionName);

                    if (isset($extends[$sectionName])) {
                        $child->addAttribute('zf:extends', $extends[$sectionName], Zend_Config_Xml::XML_NAMESPACE);
                    }

                    $this->_addBranch($data, $child, $xml);
                }
            }
        }

        $dom = dom_import_simplexml($xml)->ownerDocument;
        $dom->formatOutput = true;

        $xmlString = $dom->saveXML();

        return $xmlString;
    }

    protected function _addBranch(Zend_Config $config, SimpleXMLElement $xml, SimpleXMLElement $parent)
    {
        $branchType = null;

        foreach ($config as $key => $value) {
            if ($branchType === null) {
                if (is_numeric($key)) {
                    $branchType = 'numeric';
                    $branchName = $xml->getName();
                    $xml        = $parent;

                    unset($parent->{$branchName});
                } else {
                    $branchType = 'string';
                }
            } else if ($branchType !== (is_numeric($key) ? 'numeric' : 'string')) {
                #require_once 'Zend/Config/Exception.php';
                throw new Zend_Config_Exception('Mixing of string and numeric keys is not allowed');
            }

            if ($branchType === 'numeric') {
                if ($value instanceof Zend_Config) {
                    $child = $parent->addChild($branchName);

                    $this->_addBranch($value, $child, $parent);
                } else {
                    $parent->addChild($branchName, (string) $value);
                }
            } else {
                if ($value instanceof Zend_Config) {
                    $child = $xml->addChild($key);

                    $this->_addBranch($value, $child, $xml);
                } else {
                    $xml->addChild($key, (string) $value);
                }
            }
        }
    }
}