How do I do this? I had a look at the code for phpbb2 and the code is as follows:
if( getenv('HTTP_X_FORWARDED_FOR') != '' )
{
$client_ip = ( !empty($HTTP_SERVER_VARS['REMOTE_ADDR']) ) ? $HTTP_SERVER_VARS['REMOTE_ADDR'] : ( ( !empty($HTTP_ENV_VARS['REMOTE_ADDR']) ) ? $HTTP_ENV_VARS['REMOTE_ADDR'] : $REMOTE_ADDR );
if( preg_match( "/^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/", getenv( 'HTTP_X_FORWARDED_FOR' ), $ip_list ) )
{
$private_ip = array( '/^127\.0\.0\.1/', '/^192\.168\..*/', '/^172\.16\..*/', '/^10..*/', '/^224..*/', '/^240..*/' );
$client_ip = preg_replace( $private_ip, $client_ip, $ip_list[1] );
}
}
else
{
$client_ip = ( !empty($HTTP_SERVER_VARS['REMOTE_ADDR']) ) ? $HTTP_SERVER_VARS['REMOTE_ADDR'] : ( ( !empty($HTTP_ENV_VARS['REMOTE_ADDR']) ) ? $HTTP_ENV_VARS['REMOTE_ADDR'] : $REMOTE_ADDR );
}
Can't say I understand it much though.
