php获取用户ip的五种方式

// 获取用户ip的方式1
$ip = $_SERVER["REMOTE_ADDR"];
echo $ip;
// 获取用户ip的方式2
$user_IP = ($_SERVER["HTTP_VIA"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : $_SERVER["REMOTE_ADDR"];
$user_IP = ($user_IP) ? $user_IP : $_SERVER["REMOTE_ADDR"];
echo $user_IP;
// 获取用户ip的方式3
function getRealIp()
{
?$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 : $_SERVER[‘REMOTE_ADDR‘]);
}
echo getRealIp();
// 获取用户ip的方式4
if ($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 $ip ;
// 获取用户ip的方式5
if(getenv(‘HTTP_CLIENT_IP‘)) {
?$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;