php获取客户端的ip地址程序代码-PHP源码

function getRealIpAddr()
{
if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))
{
$ip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))
//to check ip is pass from proxy
{
$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
$ip=$_SERVER['REMOTE_ADDR'];
}
return $ip;
}

function real_ip() {
static $realip = NULL;

if ($realip !== NULL) {
return $realip;
}

if (isset($_SERVER)) {
if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);

/* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */
foreach ($arr AS $ip) {
$ip = trim($ip);

if ($ip != 'unknown') {
$realip = $ip;
break;
}
}
} elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
$realip = $_SERVER['HTTP_CLIENT_IP'];
} else {
if (isset($_SERVER['REMOTE_ADDR'])) {
$realip = $_SERVER['REMOTE_ADDR'];
} else {
$realip = '0.0.0.0';
}
}
} else {
if (getenv('HTTP_X_FORWARDED_FOR')) {
$realip = getenv('HTTP_X_FORWARDED_FOR');
} elseif (getenv('HTTP_CLIENT_IP')) {
$realip = getenv('HTTP_CLIENT_IP');
} else {
$realip = getenv('REMOTE_ADDR');
}
}

preg_match("/[d.]{7,15}/", $realip, $onlineip);
$realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

return $realip;
}