how to trap client IP address

[shane3341436]

I needed to control the client signing in to my site with the aid of their IP address. So, how can the IP address of the client computer can be trapped

[ak1dnar]

This is a very simple one to get the client IP address.But I'm not sure about the working condition of this against the firewalls.
You can find more from here .

[PHP]<?php
if (getenv(HTTP_X_ FORWARDED_FOR))
{
$domain = getenv(HTTP_X_F ORWARDED_FOR);
}
else
{
$domain = getenv(REMOTE_A DDR);
}

echo $domain;
?> [/PHP]