SyndicatedPost::guid PHP Méthode

    function guid()
    {
        $guid = null;
        if (isset($this->item['id'])) {
            // Atom 0.3 / 1.0
            $guid = $this->item['id'];
        } elseif (isset($this->item['atom']['id'])) {
            // Namespaced Atom
            $guid = $this->item['atom']['id'];
        } elseif (isset($this->item['guid'])) {
            // RSS 2.0
            $guid = $this->item['guid'];
        } elseif (isset($this->item['dc']['identifier'])) {
            // yeah, right
            $guid = $this->item['dc']['identifier'];
        }
        // Un-set or too long to use as-is. Generate a tag: URI.
        if (is_null($guid) or strlen($guid) > 250) {
            // In case we need to check this again
            $original_guid = $guid;
            // The feed does not seem to have provided us with a
            // usable unique identifier, so we'll have to cobble
            // together a tag: URI that might work for us. The base
            // of the URI will be the host name of the feed source ...
            $bits = parse_url($this->link->uri());
            $guid = 'tag:' . $bits['host'];
            // Some ill-mannered feeds (for example, certain feeds
            // coming from Google Calendar) have extraordinarily long
            // guids -- so long that they exceed the 255 character
            // width of the WordPress guid field. But if the string
            // gets clipped by MySQL, uniqueness tests will fail
            // forever after and the post will be endlessly
            // reduplicated. So, instead, Guids Of A Certain Length
            // are hashed down into a nice, manageable tag: URI.
            if (!is_null($original_guid)) {
                $guid .= ',2010-12-03:id.' . md5($original_guid);
                // If we have a date of creation, then we can use that
                // to uniquely identify the item. (On the other hand, if
                // the feed producer was consicentious enough to
                // generate dates of creation, she probably also was
                // conscientious enough to generate unique identifiers.)
            } elseif (!is_null($this->created())) {
                $guid .= '://post.' . date('YmdHis', $this->created());
                // Otherwise, use both the URI of the item, *and* the
                // item's title. We have to use both because titles are
                // often not unique, and sometimes links aren't unique
                // either (e.g. Bitch (S)HITLIST, Mozilla Dot Org news,
                // some podcasts). But it's rare to have *both* the same
                // title *and* the same link for two different items. So
                // this is about the best we can do.
            } else {
                $link = $this->permalink();
                if (is_null($link)) {
                    $link = $this->link->uri();
                }
                $guid .= '://' . md5($link . '/' . $this->item['title']);
            }
        }
        return $guid;
    }

	function poll ($crash_ts = NULL) {
		global $wpdb;

		$url = $this->uri(array('add_params' => true));
		FeedWordPress::diagnostic('updated_feeds', 'Polling feed ['.$url.']');

		$timeout = $this->setting('fetch timeout', 'feedwordpress_fetch_timeout', FEEDWORDPRESS_FETCH_TIMEOUT_DEFAULT);

		$this->simplepie = apply_filters(
			'syndicated_feed',
			FeedWordPress::fetch($this, array('timeout' => $timeout)),
			$this
		);

		// Filter compatibility mode
		if (is_wp_error($this->simplepie)) :
			$this->magpie = $this->simplepie;
		else :
			$this->magpie = new MagpieFromSimplePie($this->simplepie, NULL);
		endif;

		$new_count = NULL;

		$resume = ('yes'==$this->setting('update/unfinished'));
		if ($resume) :
			// pick up where we left off
			$processed = array_map('trim', explode("\n", $this->setting('update/processed')));
		else :
			// begin at the beginning
			$processed = array();
		endif;

		if (is_wp_error($this->simplepie)) :
			$new_count = $this->simplepie;
			// Error; establish an error setting.
			$theError = array();
			$theError['ts'] = time();
			$theError['since'] = time();
			$theError['object'] = $this->simplepie;

			$oldError = $this->setting('update/error', NULL, NULL);
			if (is_string($oldError)) :
				$oldError = unserialize($oldError);
			endif;

			if (!is_null($oldError)) :
				// Copy over the in-error-since timestamp
				$theError['since'] = $oldError['since'];
				
				// If this is a repeat error, then we should
				// take a step back before we try to fetch it
				// again.
				$this->update_setting('update/last', time(), NULL);
				$ttl = $this->automatic_ttl();
				$ttl = apply_filters('syndicated_feed_ttl', $ttl, $this);
				$ttl = apply_filters('syndicated_feed_ttl_from_error', $ttl, $this);
				$this->update_setting('update/ttl', $ttl, $this);
				$this->update_setting('update/timed', 'automatically');
			endif;
			
			do_action('syndicated_feed_error', $theError, $oldError, $this);
			
			$this->update_setting('update/error', serialize($theError));
			$this->save_settings(/*reload=*/ true);

		elseif (is_object($this->simplepie)) :
			// Success; clear out error setting, if any.
			$this->update_setting('update/error', NULL);

			$new_count = array('new' => 0, 'updated' => 0);

			# -- Update Link metadata live from feed
			$channel = $this->magpie->channel;

			if (!isset($channel['id'])) :
				$channel['id'] = $this->link->link_rss;
			endif;
	
			$update = array();
			if (!$this->hardcode('url') and isset($channel['link'])) :
				$update[] = "link_url = '".$wpdb->escape($channel['link'])."'";
			endif;
	
			if (!$this->hardcode('name') and isset($channel['title'])) :
				$update[] = "link_name = '".$wpdb->escape($channel['title'])."'";
			endif;
	
			if (!$this->hardcode('description')) :
				if (isset($channel['tagline'])) :
					$update[] = "link_description = '".$wpdb->escape($channel['tagline'])."'";
				elseif (isset($channel['description'])) :
					$update[] = "link_description = '".$wpdb->escape($channel['description'])."'";
				endif;
			endif;

			$this->merge_settings($channel, 'feed/');

			$this->update_setting('update/last', time());
			list($ttl, $xml) = $this->ttl(/*return element=*/ true);
			
			if (!is_null($ttl)) :
				$this->update_setting('update/ttl', $ttl);
				$this->update_setting('update/xml', $xml);
				$this->update_setting('update/timed', 'feed');
			else :
				$ttl = $this->automatic_ttl();
				$this->update_setting('update/ttl', $ttl);
				$this->update_setting('update/xml', NULL);
				$this->update_setting('update/timed', 'automatically');
			endif;
			$this->update_setting('update/fudge', rand(0, ($ttl/3))*60);
			$this->update_setting('update/ttl', apply_filters(
				'syndicated_feed_ttl',
				$this->setting('update/ttl'),
				$this
			));

			if (!$this->setting('update/hold') != 'ping') :
				$this->update_setting('update/hold', 'scheduled');
			endif;

			$this->update_setting('update/unfinished', 'yes');

			$update[] = "link_notes = '".$wpdb->escape($this->settings_to_notes())."'";

			$update_set = implode(',', $update);
			
			// Update the properties of the link from the feed information
			$result = $wpdb->query("
				UPDATE $wpdb->links
				SET $update_set
				WHERE link_id='$this->id'
			");
			do_action('update_syndicated_feed', $this->id, $this);

			# -- Add new posts from feed and update any updated posts
			$crashed = false;

			$posts = apply_filters(
				'syndicated_feed_items',
				$this->simplepie->get_items(),
				$this
			);

			$this->magpie->originals = $posts;

			// If this is a complete feed, rather than an incremental feed, we
			// need to prepare to mark everything for presumptive retirement.
			if ($this->is_incremental()) :
				$q = new WP_Query(array(
				'fields' => '_synfrom',
				'post_status__not' => 'fwpretired',
				'ignore_sticky_posts' => true,
				'meta_key' => 'syndication_feed_id',
				'meta_value' => $this->id,
				));
				foreach ($q->posts as $p) :
					update_post_meta($p->ID, '_feedwordpress_retire_me_'.$this->id, '1');
				endforeach;
			endif;
			
			if (is_array($posts)) :
				foreach ($posts as $key => $item) :
					$post = new SyndicatedPost($item, $this);

					if (!$resume or !in_array(trim($post->guid()), $processed)) :
						$processed[] = $post->guid();
						if (!$post->filtered()) :
							$new = $post->store();
							if ( $new !== false ) $new_count[$new]++;
						endif;

						if (!is_null($crash_ts) and (time() > $crash_ts)) :
							$crashed = true;
							break;
						endif;
					endif;
					unset($post);
				endforeach;
			endif;
			
			if ('yes'==$this->setting('tombstones', 'tombstones', 'yes')) :
				// Check for use of Atom tombstones. Spec:
				// <http://tools.ietf.org/html/draft-snell-atompub-tombstones-18>
				$tombstones = $this->simplepie->get_feed_tags('http://purl.org/atompub/tombstones/1.0', 'deleted-entry');
				if (count($tombstones) > 0) :
					foreach ($tombstones as $tombstone) :
						$ref = NULL;
						foreach (array('', 'http://purl.org/atompub/tombstones/1.0') as $ns) :
							if (isset($tombstone['attribs'][$ns])
							and isset($tombstone['attribs'][$ns]['ref'])) :
								$ref = $tombstone['attribs'][$ns]['ref'];
							endif;
						endforeach;
						
						$q = new WP_Query(array(
						'ignore_sticky_posts' => true,
						'guid' => $ref,
						'meta_key' => 'syndication_feed_id',
						'meta_value' => $this->id, // Only allow a feed to tombstone its own entries.
						));
						
						foreach ($q->posts as $p) :
							$old_status = $p->post_status;
							FeedWordPress::diagnostic('syndicated_posts', 'Retiring existing post # '.$p->ID.' "'.$p->post_title.'" due to Atom tombstone element in feed.');
							set_post_field('post_status', 'fwpretired', $p->ID);
							wp_transition_post_status('fwpretired', $old_status, $p);
						endforeach;
						
					endforeach;
				endif;
			endif;
			
			$suffix = ($crashed ? 'crashed' : 'completed');
			do_action('update_syndicated_feed_items', $this->id, $this);
			do_action("update_syndicated_feed_items_${suffix}", $this->id, $this);

			$this->update_setting('update/processed', $processed);
			if (!$crashed) :
				$this->update_setting('update/unfinished', 'no');
			endif;
			$this->update_setting('link/item count', count($posts));

			// Copy back any changes to feed settings made in the
			// course of updating (e.g. new author rules)
			$update_set = "link_notes = '".$wpdb->escape($this->settings_to_notes())."'";
			
			// Update the properties of the link from the feed information
			$result = $wpdb->query("
			UPDATE $wpdb->links
			SET $update_set
			WHERE link_id='$this->id'
			");
			
			do_action("update_syndicated_feed_completed", $this->id, $this);
		endif;
		
		// All done; let's clean up.
		$this->magpie = NULL;
		
		// Avoid circular-reference memory leak in PHP < 5.3.
		// Cf. <http://simplepie.org/wiki/faq/i_m_getting_memory_leaks>
		if (method_exists($this->simplepie, '__destruct')) :
			$this->simplepie->__destruct();
		endif;
		$this->simplepie = NULL;
		
		return $new_count;
	} /* SyndicatedLink::poll() */