Are there any best practices or recommended methods for implementing IP-based access restrictions in PHP?

To implement IP-based access restrictions in PHP, you can use the $_SERVER['REMOTE_ADDR'] variable to get the IP address of the client making the request. You can then compare this IP address against a whitelist or blacklist of allowed or denied IP addresses respectively. It is important to note that IP addresses can be spoofed or changed, so this method should be used in conjunction with other security measures. 

$allowed_ips = array('127.0.0.1', '192.168.1.1');
$client_ip = $_SERVER['REMOTE_ADDR'];

if (!in_array($client_ip, $allowed_ips)) {
    // IP address is not allowed, deny access
    http_response_code(403);
    die('Access denied');
}

Keywords

IP-based access restrictions PHP implementation methods recommended

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