简单的php获取IP地址的函数：
/**
获取IP
*/
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 = $_SERVER['REMOTE_ADDR'];
}
if(isset($_GET['debug'])){
return $_GET['debug'];
}
return $IP;
}