Get the Real IP Address Of Requested PHP Page

With Below PHP function it possible to obtain the IP address of the person requesting a page. This function takes into account the possible directions of proxies by passing the request. To locate the user's real IP is start looking at the beginning to find an IP address other than the private range. Should not be any value is taken as the REMOTE_ADDR.

<?php

function getRealIP(){

 if( isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR'] != '' ){

  $client_ip =

   ( !empty($_SERVER['REMOTE_ADDR']) ) ?

    $_SERVER['REMOTE_ADDR']

   :

            ( ( !empty($_ENV['REMOTE_ADDR']) ) ?

    $_ENV['REMOTE_ADDR']

    :

    "unknown" );



  $entries = split('[, ]', $_SERVER['HTTP_X_FORWARDED_FOR']);



  reset($entries);

  while (list(, $entry) = each($entries)){

   $entry = trim($entry);

   if ( preg_match("/^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/", $entry, $ip_list) ){

    // http://www.faqs.org/rfcs/rfc1918.html

    $private_ip = array(

     '/^0\./',

     '/^127\.0\.0\.1/',

     '/^192\.168\..*/',

     '/^172\.((1[6-9])|(2[0-9])|(3[0-1]))\..*/',

     '/^10\..*/');



    $found_ip = preg_replace($private_ip, $client_ip, $ip_list[1]);



    if ($client_ip != $found_ip){

     $client_ip = $found_ip;

     break;

    }

   }

  }

 } else {

  $client_ip =

   ( !empty($_SERVER['REMOTE_ADDR']) ) ?

    $_SERVER['REMOTE_ADDR']

   :

    ( ( !empty($_ENV['REMOTE_ADDR']) ) ?

    $_ENV['REMOTE_ADDR']

    :

    "unknown" );

 }

 return $client_ip;

}

echo getRealIP();

?>