title: can we add properties on request in laravel
body: <p>I want to use single validate for birthday year, birth month, birth day as birthday for registration in laravel 5.4 here is my code</p>
  
  <pre><code>public function register(Request $request)
  {
      // here i want to add bithday input on reqeust but nothing happen
      $request-&gt;birthday = implode('-', array(
              $request-&gt;birth_year,
              $request-&gt;birth_month,
              $request-&gt;birth_date
          ));
  
      $this-&gt;validator($request-&gt;all())-&gt;validate();
  
      event(new Registered($user = $this-&gt;create($request-&gt;all())));
  
      return redirect()-&gt;back()-&gt;with('info', 'User successfully registered');
  }
  </code></pre>
  
  <p>nothing happen with that code, I can validate those 1 by 1 using date_format. the problem is what if the user select February and day is 31</p>