defender-ip.php

<?php
/**
 * Plugin Name: [Defender Pro] - Fix Current User IP
 * Plugin URI: https://premium.wpmudev.org/
 * Description: This plugin is specially integrated with the Defender Pro plugin that sets the current user IP
 * Task: SLS-1326
 * Version: 1.0.0
 * Author: Ohid @ WPMUDEV
 * Author URI: https://premium.wpmudev.org/
 * License: GPLv2 or later
 */

if ( ! defined( 'ABSPATH' ) ) { 
  exit;
} 

if ( defined( 'WP_CLI' ) && WP_CLI ) { 
	return; 
}

add_filter('defender_user_ip', function() {
  $headers = [
      'HTTP_CLIENT_IP',
      'HTTP_X_REAL_IP',
      'HTTP_X_FORWARDED_FOR',
      'HTTP_X_FORWARDED',
      'HTTP_X_CLUSTER_CLIENT_IP',
      'HTTP_FORWARDED_FOR',
      'HTTP_FORWARDED',
      'REMOTE_ADDR',
  ];

  foreach ( $headers as $key ) {
      if ( array_key_exists( $key, $_SERVER ) === true ) {
          // Check if the variable is not an array
          if ( ! is_array( $_SERVER[ $key ] ) ) {
            return $_SERVER[ $key ];
          }
          $ip_array = explode( ',', $_SERVER[ $key ] );
          $the_ip = reset($ip_array);
          if ( $the_ip !== false ) {
            return $the_ip;
          }
          // Break the loop once we have found the IP
          break;
      }
  }
});