<?

// Return a pixel
header('Content-Type: image/png');
echo base64_decode('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=');

// Configuration
$dbhost = 'mongo-gcp-prod';
$dbname = 'creative';

// Connect to test database
$m = new Mongo("mongodb://$dbhost");
$db = $m->$dbname;

// Get the users collection
$col = $db->audipixels;

// Upsert time
$result = $col->update(
    array('_id'=>$_SERVER['HTTP_X_FORWARDED_FOR']),
    array(
        '$inc' => array('count' => 1)
    ),
    array('upsert'=>true)
);

?>