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@ 2014-10-16T19:33:45Z

<?php
function f() {
  $a = "_SERVER";
  var_dump(isset($$a));

}
f();

$a = "_SERVER";
var_dump(isset($$a));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

56.4 ms | 402 KiB | 5 Q