php - Custom cookies do not exist in wordpress file -

i have custom non - wordpress page in introduce 3 custom cookies.

setcookie("start_date", $start_date); setcookie("end_date", $end_date); setcookie("capacity", $capacity); 

when try cookies in non - wordpress file, can read them no problem. need use code below inside wordpress file , cookies seems not exist @ all

if(isset($_cookie['start_date']) && isset($_cookie['end_date'])  && isset($_cookie['capacity'])){     $date_from = $_cookie['start_date'];     $date_to = $_cookie['end_date'];     $guests = $_cookie['capacity']; }