$_cusIp = $ENV{'HTTP_X_FORWARDED_FOR'} || $ENV{REMOTE_ADDR};

##</code><code>##

$_cusIp = $ENV{'HTTP_X_FORWARDED_FOR'} or $ENV{REMOTE_ADDR};

##</code><code>##

$_cusIp = $ENV{'HTTP_X_FORWARDED_FOR'};
$_cusIp = $ENV{REMOTE_ADDR} if !$_cusIp;