The cookie is not created js

I’m planning a registration system. Right now I’m trying to send a randomly generated session string to the mysql db; besides sending it on db I want to create a cookie with the js that contains the session string. I tried with the following code

$sql = "INSERT INTO utenti (utente, email, password, anni, fos, pref, sessione) VALUES(?, ?, ?, ?, ?, ?, ?)";
$stmt = $conn->prepare($sql);
$stmt->bind_param('sssiiss', $ut, $em, $hash, $et, $fos, $gen, $randomString);
$stmt->execute();
    
?>
<script>
var date = new Date();
date.setTime(date.getTime()+(1202460601000));
document.cookie = "sessione=" + <?php echo $randomString ?> + "; expires=" + date.toGMTString();
</script>
<?php

but I don’t know why the cookie is not generated. Would anyone know how to give me a hand?

Answer

<?php $randomString = "ffafafasfasfsafaf";
echo $randomString; ?>
<script>
var date = new Date();
var randomString = '<?php echo $randomString ?>';
date.setTime(date.getTime()+(1202460601000));
document.cookie = "sessione=" + randomString + "; expires=" + date.toGMTString();
</script>

I tried this its working for me.

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Answer