在没有composer的symfony2项目上集成mixpanel

i can not to integrate mixpanel tracking with php on a symfony2 project without composer.

I have download the folder mixpanel-php and put it on my project.

i'm calling it like that:

require 'mixpanel-php/lib/Mixpanel.php';
$mp = Mixpanel::getInstance("MY_TOKEN");
$mp->track("index page");

but it does not work an the response is

Fatal error: Class 'WittPic\WebBundle\Controller\Mixpanel' not found in C:\wamp\www\wittpic\httpdocs\src\WittPic\WebBundle\Controller\PublicController.php on line 22

Mixpanel doesn't use namepsaces, so all its classes loaded into root namespace. You have to tell PHP to load Mixpanel class from root namespace by prefixing it with backslash \

$mp = \Mixpanel::getInstance("MY_TOKEN");