if(!isset($_GET['id']) with to different options with the same variable

Question

I have this code: it works fine

Answer 1

Divide your condition in to two parts.

1. First use the !isset condition and then
2. Put the rest of condition inside if condition

Your Code Look like this :

if(!isset($_GET['id'])){
  $id = $_GET['id'];
  if($id == 1000 || $id == 2000) {
     // Action
  }
}