function indexRSS()
{
/* create an RSS feed
-------------------------------------------------------------------------------------------------------------- */
$rss = new DOMTemplate(file_get_contents(FORUM_LIB . 'rss-template.xml'));
$rss->set(array('/rss/channel/title' => FORUM_NAME . (PATH ? str_replace('/', ' / ', PATH) : ''), '/rss/channel/link' => FORUM_URL . url(PATH_URL)))->remove('/rss/channel/category');
//get list of threads, sort by date; most recently modified first
$threads = preg_grep('/\\.rss$/', scandir('.'));
array_multisort(array_map('filemtime', $threads), SORT_DESC, $threads);
$items = $rss->repeat('/rss/channel/item');
//get the last post made in each thread as an RSS item
foreach (array_slice($threads, 0, FORUM_THREADS) as $thread) {
if ($xml = @simplexml_load_file($thread)) {
//if the RSS feed is valid
if ($item = @$xml->channel->item[0]) {
//if the feed has any items
$items->set(array('./title' => $item->title, './link' => $item->link, './author' => $item->author, './pubDate' => gmdate('r', strtotime($item->pubDate)), './description' => $item->description))->remove(array('./category[.="deleted"]' => !$item->xpath('category[.="deleted"]')))->next();
}
}
}
file_put_contents('index.xml', $rss);
/* sitemap
-------------------------------------------------------------------------------------------------------------- */
//we’re going to use the RSS files as sitemaps
chdir(FORUM_ROOT);
//get list of sub-forums and include the root too
$folders = array('') + array_filter(preg_grep('/^(\\.|users$|themes$|lib$)/', scandir(FORUM_ROOT . DIRECTORY_SEPARATOR), PREG_GREP_INVERT), 'is_dir');
//start the XML file. this template has an XMLNS, so we have to prefix all our XPath queries :(
$xml = new DOMTemplate(file_get_contents(FORUM_LIB . 'sitemap-template.xml'), array('x' => 'http://www.sitemaps.org/schemas/sitemap/0.9'));
//generate a sitemap index file, to point to each index RSS file in the forum:
//<https://www.google.com/support/webmasters/bin/answer.py?answer=71453>
$sitemap = $xml->repeat('//x:sitemap');
foreach ($folders as $folder) {
//get the time of the latest item in the RSS feed
//(the RSS feed may be missing as they are not generated in new folders until something is posted)
if (@($rss = simplexml_load_file(FORUM_ROOT . ($folder ? DIRECTORY_SEPARATOR . $folder : '') . DIRECTORY_SEPARATOR . 'index.xml'))) {
//if you delete the last thread in a folder, there won’t be anything in the RSS index file!
if (@$rss->channel->item[0]) {
$sitemap->set(array('./x:loc' => FORUM_URL . FORUM_PATH . ($folder ? safeURL("{$folder}/", false) : '') . 'index.xml', './x:lastmod' => gmdate('r', strtotime($rss->channel->item[0]->pubDate))))->next();
}
}
}
file_put_contents(FORUM_ROOT . DIRECTORY_SEPARATOR . 'sitemap.xml', $xml);
//you saw nothing, right?
clearstatcache();
}
//get a read/write lock on the file so that between now and saving, no other posts could slip in
//normally we could use a write-only lock 'c', but on Windows you can't read the file when write-locked!
$f = fopen("{$FILE}.rss", 'r+');
flock($f, LOCK_EX);
//we have to read the XML using the file handle that's locked because in Windows, functions like
//`get_file_contents`, or even `simplexml_load_file`, won't work due to the lock
$xml = simplexml_load_string(fread($f, filesize("{$FILE}.rss"))) or (require FORUM_LIB . 'error_xml.php');
if (!(NAME == $xml->channel->item[0]->author && formatText(TEXT, $xml) == $xml->channel->item[0]->description && !$xml->channel->xpath('category[.="locked"]'))) {
//where to?
$page = (count($thread) + 1) % FORUM_POSTS == 1 ? floor((count($thread) + 1) / FORUM_POSTS) : ceil((count($thread) + 1) / FORUM_POSTS);
$url = FORUM_URL . url('thread', PATH_URL, $FILE, $page) . '#' . base_convert(microtime(), 10, 36);
//re-template the whole thread:
$rss = new DOMTemplate(file_get_contents(FORUM_LIB . 'rss-template.xml'));
$rss->set(array('/rss/channel/title' => $xml->channel->title, '/rss/channel/link' => FORUM_URL . url('thread', PATH_URL, $FILE)))->remove(array('/rss/channel/category' => !$xml->channel->xpath('category[.="locked"]')));
//template the new reply first
$items = $rss->repeat('/rss/channel/item');
$items->set(array('./title' => sprintf(THEME_RE, count($xml->channel->item), $xml->channel->title), './link' => $url, './author' => NAME, './pubDate' => gmdate('r'), './description' => formatText(TEXT, $xml)))->remove('./category')->next();
//copy the remaining replies across
foreach ($xml->channel->item as $item) {
$items->set(array('./title' => $item->title, './link' => $item->link, './author' => $item->author, './pubDate' => $item->pubDate, './description' => $item->description))->remove(array('./category' => !$item->xpath('./category')))->next();
}
//write the file: first move the write-head to 0, remove the file's contents, and then write new one
rewind($f);
ftruncate($f, 0);
fwrite($f, $rss->html());
} else {
//if a double-post, link back to the previous post
$url = $xml->channel->item[0]->link;
}
//close the lock / file
flock($f, LOCK_UN);
