hphp/test/quick/lambda4.php

   1 <?hh
   2
   3 function function_scope() {
   4   // Shouldn't try to capture $k
   5   $bar = () ==> {
   6     foreach (array(1,2,3,4) as $k) {
   7       var_dump($k);
   8     }
   9   };
  10   $bar();
  11
  12   // Also shouldn't capture $x, $y:
  13   $baz = () ==> {
  14     $x = 12;
  15     $y = 13;
  16     echo $x . $y . "\n";
  17   };
  18   $baz();
  19
  20   // But this will capture $z, however it will be uninit at closure
  21   // allocation time (in non-repo mode). It will give a warning
  22   // closure call time. It will also give an ahead-of-type error
  23   // from hh about $z not being defined.
  24   $quux = () ==> { var_dump(isset($z)); };
  25   $z = "function scope is weird\n";
  26   echo "z in parent is now: $z\n";
  27   $quux(); // print NULL
  28 }
  29
  30 function_scope();