Php Cookie does not save the value, but a 36 long string in 16th base

I have a 4 option select with website names, which I want my code to redirect to that website. It works perfectly fine. I have added a checkbox and if the user checks that checkbox the option should be stored and when the user goes to the 4 option select should automatically be redirected whatever option the select was when the checkbox was checked. The cookie value of the website is not the name which I use to know what website the user selected, but a 32 long string (ex: ad05a843-cf49-4738-a188-6470ba192b22).

Here I set the cookie:

if(isset($_POST['save']))
    {
        setcookie('numeSite', $_POST['site-uri'], 100);
    }

And here I check whether there is a cookie with the name of the saved site or not:

    if (isset($_COOKIE['numeSite']))
{
    echo "Am intrat";
    if($_COOKIE['numeSite'] == 'amazon')
        header("Location: https://www.amazon.com");
    if($_COOKIE['numeSite'] == 'microsoft')
        header("Location: https://www.microsoft.com/ro-ro");
    if($_COOKIE['numeSite'] == 'flanco')
        header("Location: https://www.flanco.ro/");
    if($_COOKIE['numeSite'] == 'emag')
        header("Location: https://www.emag.ro/");
}

How ma I supposed to make this work?