class Conflubulator
{

  private $foo;
  private $bar;
  private $meh;

  public function __construct($foo, $bar, $meh)
  {
    $this->setFoo();
    $this->setBar();
    $this->setMeh();
  }

  private setFoo($foo)
  {
    //validate here - throw exception if invalid

    $this->foo = $foo;
  }

  private setBar($bar)
  {
    //validate here - throw exception if invalid

    $this->bar = $bar;
  }

  private setMeh($meh)
  {
    //validate here - throw exception if invalid

    $this->meh = $meh;
  }

}