rss generator

rssgenerator.php

<?php

class RssGenerator {
    public static $rssFields = array('title', 'link', 'description', 'language', 'pubDate',
                 'lastBuildDate', 'docs', 'generator', 'managingEditor', 'webMaster');
    public static $feedFields = array ('title', 'link', 'description', 'pubDate');
    private $options = array();
    private $feeds = array();
    protected function expect (array $array, $fields, $extends = false) {
        $result = array();
        foreach ($fields as $field) {
            if (!array_key_exists($field, $array)) {
                throw new Exception ("field \"{$field}\" unexpected");
            }
            $result [$field] = $array[$field];
        }
        if (!$extends && count($result)<count($array)) {
            throw new Exception("unexpected rssFields");
        }
        return $result;
    }
    public function __construct(array $options = null) {
        if (!is_null($options)) {
            $this->setOptions($options);
        }
    }
    public function setOption  ($name, $value) {
        $this->setOptions(array($name => $value));
    }
    public function setOptions (array $options) {
        $this->options = array_merge($this->options,
            $this->expect($options, self::$rssFields));
    }
    public function clearFeeds () {
        $this->feeds = array();
    }
    public function getFeeds () {
        return $this->feeds;
    }
    public function addFeeds (array $data) {
        foreach ($data as $feed) {
            $this->addFeed($feed);
        }
    }
    public function addFeed (array $feed) {
        $feed = $this->expect($feed, self::$feedFields, true);
        $this->feeds [] = $feed;
    }
    public function makeXml() {
        var_dump($this->options);
        var_dump($this->feeds);
        $xml = simplexml_load_string('<rss></rss>');
        $xml->addAttribute('version', '2.0');
        $chanel = $xml->addChild('chanel');
        foreach ($this->options as $name=>$value) {
            $chanel->addChild($name, $value);
        }
        foreach ($this->feeds as $feed) {
            $xmlFeed = $chanel->addChild('item');
            foreach ($feed as $name => $value) {
                $xmlFeed->addChild($name, $value);
            }
        }
        return $xml->asXML();
    }
}