Custom setter

If a field requires additional processing during its initialization, you can mutate its setter. To do this, create a method in the following format in the class — set{$name}Attribute. Example:

class UserDTO
{
    public int $id;
    public string $real_address;

    public function setRealAddressAttribute(string $value)
    {
        $this->real_address = strtolower($value);
    }
}