Shopping cart PHP COOKIE not running

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PHP

if (isset($_GET["ekle"])) {
echo "test";

$id = $_GET["ekle"];

setcookie("urun[" . $idi . "]", true, time() + 99999);
header("location:index.php");
} else {


echo "test2";
}
********************
cart part code
*******************
if (isset($_COOKIE['urun'])) {
echo "var";
} else {
echo "yok";
}


if (isset($_GET['boşalt'])) {
foreach ($_COOKIE['urun'] as $key => $val) {

setcookie("urun[" . $idi . "]", true, time() - 99999);
}

header("location:index.php");
} else {
echo "yok";
}

What I have tried:

When the id is clicked on the a tag, the id information is cookied.
It will take the id on the cart page to transfer and add it from mysql query accordingly.