<?php
$step = $_GET["s"];
$sku = $_GET["b"];
$u = $_GET["u"];
$orderid = $_GET["orderid"];
$bottle = substr($sku,1,1);
if ($step == "0") {
    $random = mt_rand(1, 2);
    switch(TRUE) {
        case ($random >= 1 and $random <= 1):header('Location: https://www.awebsite.com/a-page1.php?b='.$sku.'&u='.$u.'&orderid='.$orderid);break;
        case ($random >= 2 and $random <= 2):header('Location: https://www.awebsite.com/a-page2.php?b='.$sku.'&u='.$u.'&orderid='.$orderid);break;
    }
}
elseif ($step == "1") {
    if ($bottle == "1"){
        header('Location: https://www.awebsite.com/page-1.php?b='.$sku.'&u='.$u.'&orderid='.$orderid);
    }
    elseif ($bottle == "3"){
        header('Location: https://www.awebsite.com/page-3.php?b='.$sku.'&u='.$u.'&orderid='.$orderid);
    }
    elseif ($bottle == "5"){
        header('Location: https://www.awebsite.com/page-5.php?b='.$sku.'&u='.$u.'&orderid='.$orderid);
    }
    elseif ($bottle == "7"){
        header('Location: http://www.awebsite.com/thanks.php?b='.$sku.'&u='.$u.'&orderid='.$orderid);
    }
}
elseif ($step == "2") {
    header('Location: http://www.awebsite.com/thanks.php?b='.$sku.'&u='.$u.'&orderid='.$orderid);
}
?>