getip

getip.php

<?php
function get_client_ip()
{
	$ip_source = array(
		'HTTP_CLIENT_IP',
        'HTTP_X_FORWARDED_FOR',
        'HTTP_X_FORWARDED',
        'HTTP_X_CLUSTER_CLIENT_IP',
        'HTTP_FORWARDED_FOR',
        'HTTP_FORWARDED',
        'REMOTE_ADDR'
	);

    foreach ($ip_source as $key) {
        if (array_key_exists($key, $_SERVER)) {
            foreach (explode(',', $_SERVER[$key]) as $ip) {
                $ip = trim($ip);
                if ((bool) filter_var($ip,FILTER_VALIDATE_IP,FILTER_FLAG_IPV4 |FILTER_FLAG_NO_PRIV_RANGE |FILTER_FLAG_NO_RES_RANGE
                )) {
                    return $ip;
                }
            }
        }
    }
    return 'unknow';
}