php - Validating multiple attributes within a inline validator in Yii 2 -

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i'm aware can validate single attribute using inline validator such as:

['country', 'validatecountry']  public function validatecountry($attribute, $params) {     if (!in_array($this->$attribute, ['usa', 'web'])) {         $this->adderror($attribute, 'the country must either "usa" or "web".');     } }

but how go passing in multiple attributes validator? ...or should reference them via $this within validator?

instead of accessing fields directly e.g using $this->email pass additional attributes field in params, how comparevalidator works i.e

['username', 'customvalidator', 'params' => ['extrafields' => 'email']]   public function customvalidator($attribute, $params) {     //access extrafields using $this->{$params['extrafields']} }

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