php: getting ip address

Question

I want to get an ip address of visitors. could you tell me what element of $_SERVER[] i should use?

$_SERVER[\'HTTP_CLIENT_IP\'];
$_SERVER[\'HTT         


        

Answer 1

Use this:

function getIP() {
  foreach (array('HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR') as $key) {
    if (array_key_exists($key, $_SERVER) === true) {
        foreach (explode(',', $_SERVER[$key]) as $ip) {
           if (filter_var($ip, FILTER_VALIDATE_IP) !== false) {
              return $ip;
           }
        }
     }
   }
 }