Özgür TÜRK

if( isset( $_SERVER["HTTP_CLIENT_IP"] ) ) {
  $remoteIP = $_SERVER["HTTP_CLIENT_IP"];
} elseif( isset( $_SERVER["HTTP_X_FORWARDED_FOR"] ) ) {
  $remoteIP = $_SERVER["HTTP_X_FORWARDED_FOR"];
} elseif (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
  $remoteIP = $_SERVER["HTTP_CF_CONNECTING_IP"];
} else {
  $remoteIP = $_SERVER["REMOTE_ADDR"];
}
 
$ips[] = '111.111.11.11';
 
if (!in_array($remoteIP , $ips)) {
    header('HTTP/1.0 403 Forbidden');
    exit();
}