FOS\UserBundle\Model\User::setConfirmationToken PHP Method

    public function setConfirmationToken($confirmationToken)
    {
        $this->confirmationToken = $confirmationToken;
    }

 public function setConfirmationToken($confirmationToken)
 {
     parent::setConfirmationToken($confirmationToken);
     $this->setEmailConfirmedAt(null);
 }