php $_SERVER['HTTP_USER_AGENT'] 用法介绍
在php中HTTP_USER_AGENT是用来获取用户相关信息,包括了用户浏览器,操作系统工程,是否安装了alex toolbar条哦,等信息,有需要了解的朋友可参考。
1.用户访问服务器时,利用PHP的超级全局变量$_SERVER数组中字段['HTTP_USER_AGENT'] 获取访问用户的所有信息
代码如下 | 复制代码 |
echo $_SERVER['HTTP_USER_AGENT']; |
输出结果
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; InfoPath.2; AskTbPTV/5.17.0.25589; Alexa Toolbar)
2.利用正则表达式匹配以上字符串,用户的浏览器 操作系统信息
3.PHP根据匹配后的字符串(用户的浏览器 操作系统信息),分配需要的CSS文件,JS等等…返回给用户
我的浏览器 操作系统信息
Browser: Chrome 5.0
Platform: Windows 7
代码如下 | 复制代码 |
//显示访问用户的浏览器信息 //正值表达式比对解析$_SERVER['HTTP_USER_AGENT']中的字符串 获取访问用户的浏览器的信息 // 同理获取访问用户的浏览器的信息 ?> |
判断浏览器语言的具体程序如下
代码如下 | 复制代码 |
$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 4); //只取前4位,这样只判断最优先的语言。如果取前5位,可能出现en,zh的情况,影响判断。 |
判断浏览器类型主要是靠分析_SERVER["HTTP_USER_AGENT"]的内容,而分析浏览器语言则是分析_SERVER["HTTP_ACCEPT_LANGUAGE"]。

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