/**
  * @param $secret
  * @param $uid
  * @param bool $admin
  * @throws TokenException
  */
 public function generateToken($secret, $uid, $admin = false)
 {
     $tokenGenerator = new TokenGenerator($secret);
     $tokenGenerator->setData(['uid' => $uid]);
     if ($admin) {
         $tokenGenerator->setOption('admin', true);
     }
     $this->token = $tokenGenerator->create();
 }
 public function testAllowEmptyUidIfAdminOptionIsSet()
 {
     $token = $this->generator->setOption('admin', true)->create();
     $data = $this->decodeToken($token);
     $this->assertTrue($data->admin);
 }
        <script src="https://cdn.firebase.com/js/client/2.3.1/firebase.js"></script>
        <script src="js/jquery.bootstrap-growl.min.js"></script>
        <script src="js/bootstrap-select.min.js"></script>
        <script src="js/elements.js"></script>
        <script>
<?php 
require 'vendor/autoload.php';
use Firebase\Token\TokenException;
use Firebase\Token\TokenGenerator;
if ($_GET['trip']) {
    // Enable anonymous authentication and put in your firebase secret
    $secret = 'your_firebase_secret';
    $sequence = $_GET['trip'];
    try {
        $generator = new TokenGenerator($secret);
        $token = $generator->setOption("admin", true)->create();
        $sequence_share_check_url = 'https://motorbike-tracker.firebaseio.com/sequences/' . $sequence . '/share.json?auth=' . $token;
        $ch = curl_init($sequence_share_check_url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        $result = curl_exec($ch);
        if (strpos($result, "true") >= 0) {
            $generator = new TokenGenerator($secret);
            $expires = time() + 3600;
            $token = $generator->setData(['uid' => 'uid', 'provider' => 'anonymous'], ['expires' => $expires])->create();
            echo "var token = '" . $token . "'; var shared_trip='" . $sequence . "';";
        }
    } catch (TokenException $e) {
    }
} else {
}
?>