yii\behaviors\AttributeTypecastBehavior::detectAttributeTypes PHP Method

    protected function detectAttributeTypes()
    {
        $attributeTypes = [];
        foreach ($this->owner->getValidators() as $validator) {
            $type = null;
            if ($validator instanceof BooleanValidator) {
                $type = self::TYPE_BOOLEAN;
            } elseif ($validator instanceof NumberValidator) {
                $type = $validator->integerOnly ? self::TYPE_INTEGER : self::TYPE_FLOAT;
            } elseif ($validator instanceof StringValidator) {
                $type = self::TYPE_STRING;
            }
            if ($type !== null) {
                foreach ((array) $validator->attributes as $attribute) {
                    $attributeTypes[$attribute] = $type;
                }
            }
        }
        return $attributeTypes;
    }