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Set and update cookie by a select form


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I want to update a value by setting cookie. I use this code:


    if (isset($_POST['ChangeOrdering'])) {
        setcookie("Ordering", $_POST['ChangeOrdering'], time() + 31536000);
echo $_COOKIE["Ordering"];

<form method="post" action="<?php echo $_SERVER["PHP_SELF"] ?>"> Reorder messages:
<select name="ChangeOrdering">
<option value="DateAdded ASC">Oldest first</option>
<option value="DateAdded DESC">Newest first</option>
<option value="Title ASC">By Title, A-Z</option>
<option value="Title DESC">By Title, Z-A</option>
<input type="submit" value=" Save Settings " />


Problem is that echo will return the previous cookie set, not the last value. As a matter of fact, my problem is about updating the cookie. It seems that the browser load the cookie before it is updated by the POST value.

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