PHP 取得客戶端真實IP位址多種方法小結

經過複雜的判斷與算是的取得IP位址函數 

function getIP() { 
if (getenv('HTTP_CLIENT_IP')) { 
$ip = getenv('HTTP_CLIENT_IP'); 
} 
elseif (getenv('HTTP_X_FORWARDED_FOR')) { 
$ip = getenv('HTTP_X_FORWARDED_FOR'); 
} 
elseif (getenv('HTTP_X_FORWARDED')) { 
$ip = getenv('HTTP_X_FORWARDED'); 
} 
elseif (getenv('HTTP_FORWARDED_FOR')) { 
$ip = getenv('HTTP_FORWARDED_FOR'); 

} 
elseif (getenv('HTTP_FORWARDED')) { 
$ip = getenv('HTTP_FORWARDED'); 
} 
else { 
$ip = $_SERVER['REMOTE_ADDR']; 
} 
return $ip; 
}

最簡單取得ip位址程式碼一個實例 

$reIP=$_SERVER["REMOTE_ADDR"]; 
echo $reIP;

php取得ip的演算法 

if(getenv('HTTP_CLIENT_IP')) { 
$onlineip = getenv('HTTP_CLIENT_IP'); 
} elseif(getenv('HTTP_X_FORWARDED_FOR')) { 
$onlineip = getenv('HTTP_X_FORWARDED_FOR'); 
} elseif(getenv('REMOTE_ADDR')) { 
$onlineip = getenv('REMOTE_ADDR'); 
} else { 
$onlineip = $HTTP_SERVER_VARS['REMOTE_ADDR']; 
} 
echo $onlineip;

可以分出內網與外網站位址取得ip取得ip的演算法，用了？號表達式來處理 

function getip_out(){ 
$ip=false; 
if(!empty($_SERVER["HTTP_CLIENT_IP"])){ 
$ip = $_SERVER["HTTP_CLIENT_IP"]; 
} 
if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) { 
$ips教程 = 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[&#39;REMOTE_ADDR&#39;]); 
} 
echo getip_out();

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