ChromeAutoUpdate.php

<?php

namespace common\components\chrome;

use DOMDocument;

/**
 * Class ChromeAutoUpdate.
 */
class ChromeAutoUpdate
{
    /**
     * @const
     */
    const PROTOCOL_VERSION = '2.0';

    /**
     * Generates manifest XML string.
     * @param array $apps array of apps elements
     * @return string
     */
    public function generateManifest($apps)
    {
        $dom = new DOMDocument('1.0', 'utf-8');
        $gupdate = $dom->createElementNS('http://www.google.com/update2/response', 'gupdate');
        $gupdate->setAttribute('protocol', static::PROTOCOL_VERSION);
        $dom->appendChild($gupdate);
        foreach ($apps as $app) {
            $gupdate->appendChild(
                $this->buildAppSection($dom, $app['appid'], $app['codebase'], $app['version'])
            );
        }
        return $dom->saveXML();
    }

    /**
     * Builds App section
     * @param DOMDocument $dom
     * @param $appid
     * @param $codebase
     * @param $version
     * @return mixed
     */
    protected function buildAppSection(&$dom, $appid, $codebase, $version)
    {
        $app = $dom->createElement('app');
        $app->setAttribute('appid', $appid);
        $updatecheck = $dom->createElement('updatecheck');
        $updatecheck->setAttribute('codebase', $codebase);
        $updatecheck->setAttribute('version', $version);
        $app->appendChild($updatecheck);
        return $app;
    }
}