global $post; $post->ID();

function is_specific_pages(){
  $current_path = $_SERVER['REQUEST_URI'];//returns page path with leading slash

  //check if page path is one of the specific pages
  if( $current_path == '/page-1'){
   return true;
  }elseif( $current_path == '/page-2'){
   return true;
  }else{
   return false;
  }
}