[PHP] ? : where in the manual?

[Rehuel Lobato de Mesquita]

Heya guys,

I am trying to find information in the manual to explain these lines:

$goto = empty($SESSION["wantsurl"]) ?  $CFG->wwwroot  :
$SESSION["wantsurl"];
    header("Location: $goto");
  die;

Can anyone tell me where to look???

Thanx



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