»IP des Besuchers ermitteln REMOTE_ADDR, HTTP_X_FORWARDED_FOR

// set ip 
if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && isset($_SERVER['HTTP_X_FORWARDED_FOR']{6}) && ($_SERVER['HTTP_X_FORWARDED_FOR']{0} . $_SERVER['HTTP_X_FORWARDED_FOR']{1} . $_SERVER['HTTP_X_FORWARDED_FOR']{2}) != '10.') { 
   switch($_SERVER['HTTP_X_FORWARDED_FOR']{0} . $_SERVER['HTTP_X_FORWARDED_FOR']{1} . $_SERVER['HTTP_X_FORWARDED_FOR']{2} . $_SERVER['HTTP_X_FORWARDED_FOR']{3} . $_SERVER['HTTP_X_FORWARDED_FOR']{4} . $_SERVER['HTTP_X_FORWARDED_FOR']{5} . $_SERVER['HTTP_X_FORWARDED_FOR']{6}) { 
      case '192.168': 
      case '169.254': 
      case '172.16.': 
      case '172.17.': 
      case '172.18.': 
      case '172.19.': 
      case '172.20.': 
      case '172.21.': 
      case '172.22.': 
      case '172.23.': 
      case '172.24.': 
      case '172.25.': 
      case '172.26.': 
      case '172.27.': 
      case '172.28.': 
      case '172.29.': 
      case '172.30.': 
      case '172.31.': 
         break; 
      default: 
         if (preg_match("/^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/", $_SERVER['HTTP_X_FORWARDED_FOR'], $row)) { 
            $_SERVER['REMOTE_ADDR'] = $row[1]; 
         } 
   } 
}