I've been using the following code in a form for the past 10 years. With the change to J4 and PHP 8.1.27 it no longer limits the submissions to 1. Is there something that needs to be updated in the code? (I'm not a programmer - just an RSJoomla component user for years). If there is, could you post what needs to be changed? I can copy and paste if I know where the change needs to be made. Thanks.
(Getting tired of having to delete all the pile-on votes on the form)

// Define the maximum number of submissions.
$max = 1;

// Get the current IP address.
$ip = $_SERVER;

// Get the database connection.
$db = JFactory::getDbo();

// Setup the query.
$db->setQuery("SELECT COUNT(`UserIp`) FROM `#__rsform_submissions`
WHERE `UserIp`='".$db->escape($ip)."'
AND `FormId`='".(int) $formId."'");
$counter = $db->loadResult();

if ($counter >= $max){
$formLayout = '<p style="color:red;">Sorry, only one vote per user is allowed.</p>';
}

Hello,

You can try taking a look at the example nr 3 from this article.

Just added the code in the #3 section (IP address) of the article, changed the limit to 1 and since I had voted before, I tried it. Still allowed me to submit and didn't give the message.
I'll continue to monitor since there is someone out there who is trying to vote often. Right now, I'm just deleting duplicate IP submissions. And I'll recheck to make sure I put the code in the right place.