common\models\User::generateAuthKey PHP Method

    public function generateAuthKey()
    {
        $this->auth_key = Yii::$app->security->generateRandomString();
    }

 public function reg()
 {
     $user = new User();
     $user->phone = $this->phone;
     $user->email = $this->email;
     $user->status = $this->status;
     $user->setPassword($this->password);
     $user->generateAuthKey();
     if ($this->scenario === 'emailActivation') {
         $user->generateSecretKey();
     }
     $transaction = Yii::$app->db->beginTransaction();
     try {
         if ($user->save()) {
             $modelProfile = new Profile();
             $modelProfile->user_id = $user->id;
             if ($modelProfile->save()) {
                 $transaction->commit();
                 return RbacHelper::assignRole($user->getId()) ? $user : null;
             }
         } else {
             return false;
         }
     } catch (Exception $e) {
         $transaction->rollBack();
     }
 }