Gets unknown error in class

Im trying to make a token based system for my site, and im new in making classes in php. When i run a PDO query inside check function the page stop working.

<?php 

date_default_timezone_set("Europe/Copenhagen");
include_once ("../connect.php");

class userToken {

    public $token;

    public $tokenid;
    public $userId;
    public $expire;

    function __construct($t) {
        $this->tokken = $t;
        $this->check();

    }

    public function check() {
        try {

            $checkToken = $DBH->prepare("
                SELECT *
                FROM token
                WHERE token = :token
                LIMIT 1
            ");

            $checkToken->execute(array(':token' => "186382asd"));

        } catch(PDOException $e) {

            echo $e->getMessage();
            echo '[{"error":true"}]';
            exit();

        }
        return "done";

    }

}

$test = new userToken("186382asd");

echo $test->token;
?>