What steps can be taken to troubleshoot and debug the issue with the visitor counter?

The issue with the visitor counter may be due to incorrect tracking or updating of the counter variable. To troubleshoot and debug this issue, you can check if the counter variable is being properly incremented and displayed on the webpage. Additionally, ensure that the counter is being updated in a persistent manner, such as storing the count in a database or session variable.

<?php
session_start();

// Check if the counter variable is set in the session
if (!isset($_SESSION['counter'])) {
    $_SESSION['counter'] = 0;
}

// Increment the counter variable
$_SESSION['counter']++;

// Display the visitor count
echo "Visitor count: " . $_SESSION['counter'];
?>