chyba v PHP

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Mam na PC PHP3 aj PHP4, ked zadam interpreta PHP3, tak je vsetk OK,
ked zadam PHP4 tak mi pri tejto podmienke:

if ($id == "stat\2000") $poc = "stat2000";

vypise takuto chybu:

Warning: Undefined variable: id in E:\WEB\OUP Levice\index.php on line 17

Co by s tym mohlo byt?
Vyzera to tak, ze mam nastavene zobrazovanie vsetkych chybovych hlaseni,
a stacilo by nieco taketo: 

var $id: string;

Ale toto nefunguje... Na zaciatku $id="", takze asi toto mu vadi.

Lasky

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