How can an IP lock be implemented in a PHP counter script?

To implement an IP lock in a PHP counter script, you can store the IP addresses of users who have reached the limit in a database or a file. Before incrementing the counter, check if the user's IP address is in the list of locked IPs. If it is, do not increment the counter. 

// Connect to database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "counter_db";

$conn = new mysqli($servername, $username, $password, $dbname);

// Get user's IP address
$ip = $_SERVER['REMOTE_ADDR'];

// Check if IP address is in the list of locked IPs
$sql = "SELECT ip FROM locked_ips WHERE ip = '$ip'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // IP is locked, do not increment counter
    echo "IP address is locked.";
} else {
    // Increment counter
    $sql = "UPDATE counter SET count = count + 1";
    $conn->query($sql);
}

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

Keywords

IP lock PHP counter script implementation security authentication

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