Variable variable Superglobals

Question

In PHP ...

var_dump(${\'_GET\'});   // array(0) { } - #1

$var = \'_GET\';
var_dump(${$var});     // array(0) { } - #2

function test() {
  var_dump(${\'_GET         


        

Answer 1

It's not a bug, it's a feature:

Warning

Please note that variable variables cannot be used with PHP's Superglobal arrays within functions or class methods. The variable $this is also a special variable that cannot be referenced dynamically.