php怎麼擷取真實IP

php如何擷取真實IP
試了網上很多代碼都不行，但是ip138每次都能顯示我的真實ip。特求各位大俠支招。

比如我用一般的php獲得的我的ip地址是：60.55.8.229 - 浙江寧波

但是ip38.com擷取的我的IP地址是：[42.196.192.67] 來自：上海市 長城寬頻

ip138才是正確的。

我在醫院裡測試也是這樣，自己的php代碼擷取的IP是浙江杭州

但是ip138卻能獲得我的真實ip，上海交通大學

我現在用的PHP代碼如下：

function GetIP(){ 
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) 
$ip = getenv("HTTP_CLIENT_IP"); 
else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) 
$ip = getenv("HTTP_X_FORWARDED_FOR"); 
else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) 
$ip = getenv("REMOTE_ADDR"); 
else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) 
$ip = $_SERVER['REMOTE_ADDR']; 
else 
$ip = "unknown"; 
return($ip); 
} 
echo GetIP();

------解決方案--------------------
這是我的方法:

Function curIp(){
$ip='';
IF(Getenv('HTTP_CLIENT_IP') And StrCaseCmp(Getenv('HTTP_CLIENT_IP'),'unknown')){
$ip=Getenv('HTTP_CLIENT_IP');
}ElseIF(Getenv('HTTP_X_FORWARDED_FOR') And StrCaseCmp(Getenv('HTTP_X_FORWARDED_FOR'),'unknown')){
$ip=Getenv('HTTP_X_FORWARDED_FOR');
}ElseIF(Getenv('REMOTE_ADDR')And StrCaseCmp(Getenv('REMOTE_ADDR'),'unknown')){
$ip=Getenv('REMOTE_ADDR');
}ElseIF(isset($_SERVER['REMOTE_ADDR']) And $_SERVER['REMOTE_ADDR'] And StrCaseCmp($_SERVER['REMOTE_ADDR'],'unknown')){
$ip=$_SERVER['REMOTE_ADDR'];
}Else{
$ip='127.0.0.1';
}
Return $ip;
}

------解決方案--------------------
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中第一個非unknown的有效IP字串 */
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');
}
}
$onlineip = null;
preg_match("/[\d\.]{7,15}/", $realip, $onlineip);
$realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

return $realip;
}
------解決方案--------------------

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