Somebody knows why I cannot reach the $HTTP_SESSION_VARS in a function ....

For example, why does this not output the "en-US" string three times:

<?
  session_register("LangID");
  $HTTP_SESSION_VARS["LangID"] = "en-US";
  echo($HTTP_SESSION_VARS["LangID"]);
  echo("**");
  function CurrentLang(){
    $language = $HTTP_SESSION_VARS["LangID"];
    echo($language);
  }
  CurrentLang();
  echo("**");
  echo($HTTP_SESSION_VARS["LangID"]);

?>



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