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function _escapeXML($str)

{

$translation = get_html_translation_table(HTML_ENTITIES, ENT_QUOTES);

foreach ($translation as $key => $value)

{

$translation[$key] = ‘&#‘ . ord($key) . ‘;’;

}

$translation[chr(38)] = ‘&‘;

return preg_replace(“/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,3};)/“,”&”,

strtr($str, $translation));

}

// the class constructor is executed when creating an instance of the class

function RSSFactory($title, $link, $description,

$language = ‘en-us’, $items = array())

{

// save feed data to local class members

$this->_title = $title;

$this->_link = $link;

$this->_description = $description;

$this->_language = $language;

$this->_items = $items;

}

// adds a new feed item

function addItem($title, $link, $description, $additional_fields = array())

{

// add feed item

$this->_items[] =

array_merge(array(‘title’ => $title,

‘link’ => $link,

‘description’ => $description),

$additional_fields);

}

// generates feed

function get()

{

// initial preparations

ob_start();

header(‘Content-type: text/xml’);

// generate feed header

echo ‘<rss version=”2.0”>’ .

‘<channel>’ .

‘<title>’ . RSSFactory::_escapeXML($this->_title) . ‘</title>’ .

‘<link>’ . RSSFactory::_escapeXML($this->_link) . ‘</link>’ .

‘<description>’ .

RSSFactory::_escapeXML($this->_description) .

‘</description>’;

// add feed items

foreach ($this->_items as $feed_item)

{

155

Chapter 7: Web Feeds and Social Bookmarking

c07.qxd:c07 10:42 155

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