网学网为广大网友收集整理了，php下获取客户端ip地址的函数，希望对大家有所帮助！

复制代码 代码如下:
function getip() {
$IP=getenv(''REMOTE_ADDR'');
$IP_ = getenv(''HTTP_X_FORWARDED_FOR'');
if (($IP_ != "") && ($IP_ != "unknown")) $IP=$IP_;
return $IP;
}

下面这个比较好的
复制代码 代码如下:
function getIP()
{
if (isset( SERVER)) {
if (isset( SERVER[''HTTP_X_FORWARDED_FOR''])) {
$realip = SERVER[''HTTP_X_FORWARDED_FOR''];
} elseif (isset( SERVER[''HTTP_CLIENT_IP''])) {
$realip = SERVER[''HTTP_CLIENT_IP''];
} else {
$realip = SERVER[''REMOTE_ADDR''];
}
} else {
if (getenv("HTTP_X_FORWARDED_FOR")) {
$realip = getenv( "HTTP_X_FORWARDED_FOR");
} elseif (getenv("HTTP_CLIENT_IP")) {
$realip = getenv("HTTP_CLIENT_IP");
} else {
$realip = getenv("REMOTE_ADDR");
}
}
return $realip;
}