hphp/test/slow/is_expression/is-expression-this2.php

   1 <?hh
   2
   3 trait T {
   4   public static function isThis(mixed $x): void {
   5     if ($x is this) {
   6       echo "this\n";
   7     } else {
   8       echo "not this\n";
   9     }
  10   }
  11 }
  12
  13 class C {
  14   use T;
  15 }
  16
  17 final class D extends C {}
  18
  19 C::isThis(new C());
  20 C::isThis(new D());
  21 C::isThis(new stdClass());
  22 C::isThis(null);
  23 C::isThis(true);
  24 C::isThis(1.5);
  25 C::isThis(1);
  26 C::isThis(STDIN);
  27
  28 echo "\n";
  29
  30 D::isThis(new C());
  31 D::isThis(new D());
  32 D::isThis(new stdClass());
  33 D::isThis(null);
  34 D::isThis(true);
  35 D::isThis(1.5);
  36 D::isThis(1);
  37 D::isThis(STDIN);
  38
  39 echo "\n";
  40
  41 T::isThis(new C());
  42 T::isThis(new D());