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@ 2012-12-05T01:06:58Z

<?php
session_start();

function foo() {
  $t = '_SESSION';
  $a = $$t;             // not work
  $b = ${'_SESSION'};   // works
  var_dump($a, $b);
}

foo();

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
session_start: documentation ( source)

preferences:dark modelive preview

38.76 ms | 402 KiB | 5 Q