Every php coder want to store IP address of user for tracking and other different purpose.
Here is the function which i am using in my code to store ip address in db.
//This returns the True IP of the client calling the requested page
// Checks to see if HTTP_X_FORWARDED_FOR
// has a value then the client is operating via a proxy
$userIP = $_SERVER['HTTP_X_FORWARDED_FOR'];
if($userIP == "")
$userIP = $_SERVER['REMOTE_ADDR'];
// return the IP we've figured out:
You can use this simple php function in different ways.