yii\base\Model::createValidators PHP Method

    public function createValidators()
    {
        $validators = new ArrayObject();
        foreach ($this->rules() as $rule) {
            if ($rule instanceof Validator) {
                $validators->append($rule);
            } elseif (is_array($rule) && isset($rule[0], $rule[1])) {
                // attributes, validator type
                $validator = Validator::createValidator($rule[1], $this, (array) $rule[0], array_slice($rule, 2));
                $validators->append($validator);
            } else {
                throw new InvalidConfigException('Invalid validation rule: a rule must specify both attribute names and validator type.');
            }
        }
        return $validators;
    }

 /**
  * @inheritdoc
  */
 public function createValidators()
 {
     $validators = parent::createValidators();
     $rules = $this->rules;
     array_unshift($rules, ['safe']);
     foreach ($rules as $rule) {
         if ($rule instanceof Validator) {
             $validators->append($rule);
         } elseif (is_array($rule) && isset($rule[0])) {
             // attributes, validator type
             $validator = Validator::createValidator($rule[0], $this, ['value'], array_slice($rule, 1));
             $validators->append($validator);
         } else {
             throw new InvalidConfigException('Invalid validation rule: a rule must specify validator type.');
         }
     }
     return $validators;
 }