Cloudflare - Set real IP

cloudflare_real_ip.php

<?php

// Cloudflare - Set Real IP
  $cloudflare_ip_ranges = array(
    '204.93.240.0/24', '204.93.177.0/24', '199.27.128.0/21',
    '173.245.48.0/20', '103.21.244.0/22', '103.22.200.0/22',
    '103.31.4.0/22',   '141.101.64.0/18', '108.162.192.0/18',
    '190.93.240.0/20', '188.114.96.0/20', '197.234.240.0/22',
    '198.41.128.0/17', '162.158.0.0/15',
  );

  if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
    foreach ($cloudflare_ip_ranges as $cidr) {
      list($subnet, $mask) = explode('/', $cidr);
      if ((ip2long($_SERVER['REMOTE_ADDR']) & ($mask = ~ ((1 << (32 - $mask)) - 1))) == (ip2long($subnet) & $mask)) {
        $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
        break;
      }
    }
  }