PHP获取用户访问IP地址的5种方法：
<?php //方法1：
ip=_SERVER["REMOTE_ADDR"];
echo $ip;
//方法2：
userIP=(_SERVER["HTTP_VIA"]) ? _SERVER["HTTP_X_FORWARDED_FOR"] :_SERVER["REMOTE_ADDR"];
userIP=(user_IP) ? userIP:_SERVER["REMOTE_ADDR"];
echo $user_IP;
//方法3：
function getRealIp()
{
$ip=false;
if(!empty($_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 : $_SERVER['REMOTE_ADDR']);
}
echo getRealIp();
//方法4：
if ($HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"])
{
ip=HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"];
}
elseif ($HTTP_SERVER_VARS["HTTP_CLIENT_IP"])
{
ip=HTTP_SERVER_VARS["HTTP_CLIENT_IP"];
}
elseif ($HTTP_SERVER_VARS["REMOTE_ADDR"])
{
ip=HTTP_SERVER_VARS["REMOTE_ADDR"];
}
elseif (getenv("HTTP_X_FORWARDED_FOR"))
{
$ip = getenv("HTTP_X_FORWARDED_FOR");
}
elseif (getenv("HTTP_CLIENT_IP"))
{
$ip = getenv("HTTP_CLIENT_IP");
}
elseif (getenv("REMOTE_ADDR"))
{
$ip = getenv("REMOTE_ADDR");
}
else
{
$ip = "Unknown";
}
echo $ip ;
//方法5：
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;
