程式設計@筆記

<?php

//函數一
function getUserIP()
{
$client = @$_SERVER['HTTP_CLIENT_IP'];
$forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
$remote = $_SERVER['REMOTE_ADDR'];
if(filter_var($client, FILTER_VALIDATE_IP))
{
$ip = $client;
}
elseif(filter_var($forward, FILTER_VALIDATE_IP))
{
$ip = $forward;
}
else
{
$ip = $remote;
}
return $ip;
}
$user_ip = getUserIP();

echo $user_ip;
?>

<?php

//函數二

function get_real_ip(){ 

$ip=false;
if(!empty($_SERVER["HTTP_CLIENT_IP"])){
$ip=$_SERVER["HTTP_CLIENT_IP"];
}
if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$ips=explode (", ", $_SERVER['HTTP_X_FORWARDED_FOR']);
if ($ip) { array_unshift($ips, $ip); $ip=FALSE; }
for ($i=0; $i < count($ips); $i++) {
if (!eregi ("^(10|172.16|192.168).", $ips[$i])) {
$ip=$ips[$i];
break;
}
}
}
return ($ip ? $ip : $_SERVER['REMOTE_ADDR']);
}

?>