PHP中获取IP的方法

PHP获取客户端 真实IP地址多种方法

<?php
//经过复杂的判断与算是的获取IP地址函数
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;
}
echo '<br>1---'.getIP();
//最简单获取ip地址代码一句实例

$reIP=$_SERVER["REMOTE_ADDR"];
echo '<br>2---'.$reIP;

//

//php教程获取ip的算法
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 = $HTTP_SERVER_VARS[REMOTE_ADDR];
}
echo '<br>3---'.$onlineip;
//可以分出内网与外网站ip地址获取程序

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[REMOTE_ADDR]);
}

echo '<br>4---'.getip_out();

//php获取ip的算法，用了？号表达式来处理

$user_IP = ($_SERVER["HTTP_VIA"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : $_SERVER["REMOTE_ADDR"];
$user_IP = ($user_IP) ? $user_IP : $_SERVER["REMOTE_ADDR"];
echo '<br>5---'.$user_IP;
?>