frontend\models\PasswordResetVerifyForm::generateToken PHP Method

    public function generateToken()
    {
        $mobile = $this->_session['passwordResetMobile'];
        $this->_user = User::findByMobile($mobile);
        if (!User::isPasswordResetTokenValid($this->_user->password_reset_token)) {
            $this->_user->generatePasswordResetToken();
        }
        return $this->_user->save(false);
    }