функция определение ip-адресов

                        
function RealIP ()

{

   if( $_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 ) )

{

$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 ]);