Google Analytics / trackEvent

- spécification d'un id unique pour les visiteurs pour éviter de compter plusieurs fois les visites
- trace la session

library/Class/WebService/Analytics/Client.php

@@ -49,10 +49,40 @@ class Class_WebService_Analytics_Client {
 	public function trackEvent($category, $action, $label, $value) {
 		$tracker = $this->getTracker();
 		$event = new GoogleAnalytics\Event($category, $action, $label, $value, true);
-		$tracker->trackEvent($event, new GoogleAnalytics\Session(), new GoogleAnalytics\Visitor());
+
+		$visitor = $this->getOrCreateVisitor();
+
+		$tracker->trackEvent($event, new GoogleAnalytics\Session(), $visitor);
+
 		return $this;
 	}
-	
+
+
+	public function getOrCreateVisitor() {
+		// cf: https://code.google.com/p/php-ga/issues/detail?id=18
+		$session = new Zend_Session_Namespace('analyticsClient');
+
+		// Assemble Visitor information
+    // (could also get unserialized from database)
+		if( !isset($session->uniqueID) ) {
+			$visitor = new GoogleAnalytics\Visitor();
+			$session->uniqueID = generateHash(rand(1000000,2000000));
+		}	else {
+			$visitor = unserialize($session->visitor);
+		}
+
+		$visitor->setUniqueId($session->uniqueID);
+		$visitor->setIpAddress($_SERVER['REMOTE_ADDR']);
+		$visitor->setUserAgent($_SERVER['HTTP_USER_AGENT']);
+		$visitor->setScreenResolution('1024x768');
+
+    // Assemble Session information
+    // (could also get unserialized from PHP session)
+		$session = new GoogleAnalytics\Session();
+
+		$visitor->addSession($session);
+		$session->visitor = serialize($visitor);
+	}
 }
 
 ?>
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