php ip address of visitor

1$clientIPAddress=$_SERVER['REMOTE_ADDR']; 

1<?PHP
2
3function getUserIP()
4{
5    // Get real visitor IP behind CloudFlare network
6    if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
7              $_SERVER['REMOTE_ADDR'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
8              $_SERVER['HTTP_CLIENT_IP'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
9    }
10    $client  = @$_SERVER['HTTP_CLIENT_IP'];
11    $forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
12    $remote  = $_SERVER['REMOTE_ADDR'];
13
14    if(filter_var($client, FILTER_VALIDATE_IP))
15    {
16        $ip = $client;
17    }
18    elseif(filter_var($forward, FILTER_VALIDATE_IP))
19    {
20        $ip = $forward;
21    }
22    else
23    {
24        $ip = $remote;
25    }
26
27    return $ip;
28}
29
30
31$user_ip = getUserIP();
32
33echo $user_ip; // Output IP address [Ex: 177.87.193.134]
34
35
36?>