sorry man but its not exploit
u forgot something
include("track_config.php");
and this code in the begining of ur file that contain the exploit
and the config file have value for
$header
track_config.php
//Design
$header="c_header.php";
$footer="c_footer.php";
so it CAAAAAANT BE INCLUSION
it already have value in the config aaaand the tracking.php file included the
config so its not inclusion