What are some best practices for implementing IP address blocking in an Admin Control Panel (ACP) using PHP?

IP address blocking in an Admin Control Panel (ACP) using PHP can help prevent unauthorized access and protect sensitive information. One best practice is to maintain a list of blocked IP addresses in a database or configuration file, allowing for easy management and scalability. Additionally, consider implementing a user-friendly interface in the ACP to add, remove, and view blocked IP addresses.

// Check if the user's IP address is in the list of blocked IPs
$blocked_ips = ['127.0.0.1', '192.168.1.1']; // Example list of blocked IPs

if (in_array($_SERVER['REMOTE_ADDR'], $blocked_ips)) {
    // Redirect the user or display an error message
    header("Location: access_denied.php");
    exit();
}