php获取真实内网IP方法

function getIP() {
    if (isset($_SERVER)) {
        if (isset($_SERVER["HTTP_CDN_SRC_IP"])) {
            $realip = $_SERVER["HTTP_CDN_SRC_IP"];
        } else if (isset($_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 {
            $realip = getenv("REMOTE_ADDR");
        }
    }
    //如果是代理服务器，有可能返回两个IP,这是取第一个即可
    if (stristr($realip, ‘,‘))
        $realip = strstr($realip, ‘,‘, true);
    return (str_replace(‘#‘, ‘‘, $realip));
}