Summary of various methods to obtain the real IP address of the client in PHP-PHP Tutorial-php.cn

Summary of various methods to obtain the real IP address of the client in PHP

高洛峰

Release： 2023-03-05 08:16:01

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After complex judgment and calculation, the function of obtaining the IP address

function getIP() { 
if (getenv(&#39;HTTP_CLIENT_IP&#39;)) { 
$ip = getenv(&#39;HTTP_CLIENT_IP&#39;); 
} 
elseif (getenv(&#39;HTTP_X_FORWARDED_FOR&#39;)) { 
$ip = getenv(&#39;HTTP_X_FORWARDED_FOR&#39;); 
} 
elseif (getenv(&#39;HTTP_X_FORWARDED&#39;)) { 
$ip = getenv(&#39;HTTP_X_FORWARDED&#39;); 
} 
elseif (getenv(&#39;HTTP_FORWARDED_FOR&#39;)) { 
$ip = getenv(&#39;HTTP_FORWARDED_FOR&#39;); 

} 
elseif (getenv(&#39;HTTP_FORWARDED&#39;)) { 
$ip = getenv(&#39;HTTP_FORWARDED&#39;); 
} 
else { 
$ip = $_SERVER[&#39;REMOTE_ADDR&#39;]; 
} 
return $ip; 
}

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The simplest example of obtaining the IP address code

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

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The algorithm of obtaining the IP in php

if(getenv(&#39;HTTP_CLIENT_IP&#39;)) { 
$onlineip = getenv(&#39;HTTP_CLIENT_IP&#39;); 
} elseif(getenv(&#39;HTTP_X_FORWARDED_FOR&#39;)) { 
$onlineip = getenv(&#39;HTTP_X_FORWARDED_FOR&#39;); 
} elseif(getenv(&#39;REMOTE_ADDR&#39;)) { 
$onlineip = getenv(&#39;REMOTE_ADDR&#39;); 
} else { 
$onlineip = $HTTP_SERVER_VARS[&#39;REMOTE_ADDR&#39;]; 
} 
echo $onlineip;

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can be divided into Procedure for obtaining IP addresses from internal and external websites

function getip_out(){ 
$ip=false; 
if(!empty($_SERVER["HTTP_CLIENT_IP"])){ 
$ip = $_SERVER["HTTP_CLIENT_IP"]; 
} 
if (!empty($_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;])) { 
$ips教程 = explode (", ", $_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;]); 
if ($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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php algorithm for obtaining IP, what is used? Expression to process

$user_IP = ($_SERVER["HTTP_VIA"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : $_SERVER["REMOTE_ADDR"]; 
$user_IP = ($user_IP) ? $user_IP : $_SERVER["REMOTE_ADDR"];

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For more PHP summary of multiple methods to obtain the client’s real IP address, please pay attention to the PHP Chinese website for related articles!