/**
* Remove all the feed transients attached to our links. Originally
* this removed "MagpieRSS" and "SimplePie" feed options/transients by
* direct sql. This had to be changed for VIP compatibility.
*
* It looks like the SimplePie RSS is the only currently used method for
* feed retrieval (on current systems, ie. local environment and most likely
* VIP platform), so we are looping through the links that are part of FWP's
* syndication, and clears their transient.
*
* It looks like Magpie's options are stored simply too, so we added
* support to remove its options/caches as well for any of our links.
*/
function clear_cache()
{
// Set our counters
$simplepies = $magpies = 0;
// Grab all our links
$links = FeedWordPress::syndicated_links();
if (!empty($links) && is_array($links)) {
foreach ($links as $link) {
$link_hash = md5($link->link_rss);
$magpie_option = 'rss_' . $link_hash;
if (get_option($magpie_option)) {
// It's a MagpieRSS feed, clear the options
delete_option($magpie_option);
delete_option($magpie_option . '_ts');
// clear timestamp as well
$magpies++;
} else {
// It's a SimplePie object, use its methods
$trans = new WP_Feed_Cache_Transient('', $link_hash, '');
$trans->unlink();
$simplepies++;
}
}
}
return $magpies + $simplepies;
}
/**
* Checks to see if all of the feed url in $check_urls are cached.
*
* If $check_urls is empty, look for the rss feed url found in the dashboard
* widget optios of $widget_id. If cached, call $callback, a function that
* echoes out output for this widget. If not cache, echo a "Loading..." stub
* which is later replaced by AJAX call (see top of /wp-admin/index.php)
*
* @since 2.5.0
*
* @param string $widget_id
* @param callback $callback
* @param array $check_urls RSS feeds
* @return bool False on failure. True on success.
*/
function wp_dashboard_cached_rss_widget($widget_id, $callback, $check_urls = array())
{
$loading = '<p class="widget-loading">' . __('Loading…') . '</p>';
if (empty($check_urls)) {
$widgets = get_option('dashboard_widget_options');
if (empty($widgets[$widget_id]['url'])) {
echo $loading;
return false;
}
$check_urls = array($widgets[$widget_id]['url']);
}
include_once ABSPATH . WPINC . '/class-feed.php';
foreach ($check_urls as $check_url) {
$cache = new WP_Feed_Cache_Transient('', md5($check_url), '');
if (!$cache->load()) {
echo $loading;
return false;
}
}
if ($callback && is_callable($callback)) {
$args = array_slice(func_get_args(), 2);
array_unshift($args, $widget_id);
call_user_func_array($callback, $args);
}
return true;
}