最近有个需求就是获取下本地的ip地址、网上搜索了相关的教程，总结一下分享给大家、有需要的小伙伴可以参考一下

一、简单的获取 User Agent 信息代码:

echo $_SERVER['HTTP_USER_AGENT'];

二、获取访客操作系统信息:

/**  * 获取客户端操作系统信息,包括win10 * @param   null  * @return  string   */  
<?php
function GetOs() {if (!empty($_SERVER['HTTP_USER_AGENT'])) {$OS = $_SERVER['HTTP_USER_AGENT'];if (preg_match('/win/i', $OS)) {$OS = 'Windows';} elseif (preg_match('/mac/i', $OS)) {$OS = 'MAC';} elseif (preg_match('/linux/i', $OS)) {$OS = 'Linux';} elseif (preg_match('/unix/i', $OS)) {$OS = 'Unix';} elseif (preg_match('/bsd/i', $OS)) {$OS = 'BSD';} else {$OS = 'Other';}return $OS;} else {return "获取访客操作系统信息失败！";}} ?>

三、获取浏览器信息:

<?php
function GetBrowser() {if (!empty($_SERVER['HTTP_USER_AGENT'])) {$br = $_SERVER['HTTP_USER_AGENT'];if (preg_match('/MSIE/i', $br)) {$br = 'MSIE';} elseif (preg_match('/Firefox/i', $br)) {$br = 'Firefox';} elseif (preg_match('/Chrome/i', $br)) {$br = 'Chrome';} elseif (preg_match('/Safari/i', $br)) {$br = 'Safari';} elseif (preg_match('/Opera/i', $br)) {$br = 'Opera';} else {$br = 'Other';}return $br;} else {return "获取浏览器信息失败！";}} ?>

四、获取客户的 IP 地址

<?php
//获取ip
function getip() {if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP") , "unknown")) {$ip = getenv("HTTP_CLIENT_IP");} else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR") , "unknown")) {$ip = getenv("HTTP_X_FORWARDED_FOR");} else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR") , "unknown")) {$ip = getenv("REMOTE_ADDR");} else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) {$ip = $_SERVER['REMOTE_ADDR'];} else {$ip = "unknown";}return $ip;}

五、补充

补充一下网站使用 CDN 以后无法获取用户真实 IP 的解决方法：

function GetClientIP(){$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];if($ip != ""){$arr = explode(",",$ip);return $arr[0];}else{return $_SERVER["REMOTE_ADDR"];