数组的Yii2验证规则

Question

I've an attribute in model which I want to validate in such a way that - It must be an array and must have 3 element, also every element inside array must be a string. Currently I'm using.

['config', 'each', 'rule' => ['string']]

Answer 1

You could simply use a custom validator, e.g. :

['config', function ($attribute, $params) {
    if(!is_array($this->$attribute) || count($this->$attribute)!==3){
         $this->addError($attribute, 'Error message');
    }
}],
['config', 'each', 'rule' => ['string']]

Read more about creating validators.