sqrlexample\ExampleStatefulStorage::checkIdentityKey PHP Метод

    public function checkIdentityKey($key)
    {
        $sql = "SELECT disabled FROM sqrl_pubkey WHERE public_key = ?";
        $stmt = $this->conn->prepare($sql);
        $stmt->execute(array($key));
        $result = $stmt->fetchColumn();
        if ($result === false) {
            return self::IDENTITY_UNKNOWN;
        } else {
            return $result === '1' ? self::IDENTITY_LOCKED : self::IDENTITY_ACTIVE;
        }
    }