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im having troubles with setting cookies in my website (since its the first time using them). Basicly i have this form on a article page:

<form method="POST" action="">
    <input type="submit" value="<?php echo $id ?>"  name="commentData">
</form>

and with this function i can store the id in my cookie:

if (isset($_POST['commentData'])) {
        $cookie_value = $_POST["commentData"];
        $cookie_name = "saved_articles";
        setcookie($cookie_name, $cookie_value, time() + 600, '/');
    }

Now i need to be able to store multiple ids in my cookies so i can loop on my 'saved articles' page. Currently it always override the value. Any help would be greatly appreciated