php获取客户端IP地址方法总结

用php获取客户端IP地址的方法，具体代码如下：

$iipp=$_SERVER["REMOTE_ADDR"];
echo $iipp;
?>
/////////////////////////////-------------下面是我自己学写的留言板的部分代码----------------------------

echo $_POST['name'].'

';
echo $_POST['sex'].'

';
echo $_POST['email'].'

';
echo $_POST['info'].'

';

$ip=$_SERVER["REMOTE_ADDR"];
  
//------基本设定--------
$mysql_server_name="localhost";
$mysql_username    ="root";
$mysql_password    ="123456";
$mysql_database    ="liuyanban";
//----------

//准备好你的sql语法（新建）
$sql="INSERT INTO `gbook` (`id` ,`name` ,`sex` ,`email` ,`info` ,`ip` ,`time_at` )VALUES ('', '".$_POST['name']."', '".$_POST['sex']."', '".$_POST['email']."', '".$_POST['info']."', '".$ip."', NOW( ) )";
$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password);
mysql_select_db($mysql_database,$conn);
$result=mysql_query($sql);
$id=mysql_insert_id();
mysql_close($conn);

?>
///////////////////////////////////////////////

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

echo $user_IP;
?>

///////////////////////////////////////////////

function get_real_ip(){
$ip=false;
if(!empty($_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 get_real_ip();
?>

///////////////////////////////////////////////

php获取ip的算法:
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
{
$ip = "Unknown";
}
echo "你的IP:".$ip ;
?>

///////////////////////////////////////////////

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;
?>