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How can PHP developers effectively troubleshoot and customize a visitor counter script for their website?

Issue: To troubleshoot and customize a visitor counter script for a website, PHP developers can start by checking the code for any errors or bugs that may be causing issues with the counter functionality. They can also customize the script by adding features such as tracking unique visitors or displaying the counter in a specific format. Code snippet:

php 
<?php
// Connect to database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "dbname";
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Update visitor count
$sql = "UPDATE visitor_counter SET count = count + 1 WHERE id = 1";
$conn->query($sql);

// Display visitor count
$sql = "SELECT count FROM visitor_counter WHERE id = 1";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "Total visitors: " . $row["count"];
    }
} else {
    echo "0 visitors";
}

// Close connection
$conn->close();
?>

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