摘自: amxku.net
一开始我还认为php完全是可以获取到client的mac的，很是荒谬。最后还被云舒鄙视了一番。
这完全不可能的。php是不肯能直接获取到client的mac的。
首先php完全就是在服务端解释执行的，所以没可能直接获取到浏览端的网卡MAC，因为浏览器默认行为是不会把MAC发送出去的。
要是从数据包的角度来解释的话，一般都是在局域网内部传输时才会包上MAC头，经过路由不断转发，实际上每经过一级设备都被剥去一层，到最后就只剩下TCP/IP的数据头和数据了。MAC只可能是在网络底层的物理层中传输。（也就是说client的mac地址信息是不可能在公网上传输的，公网上的MAC信息是最后一跳设备的接口MAC，见Hell-Phantom评论）
从http协议来讲，也是不可能的。http请求中也不可能带上mac地址。可以看看http协议的相关说明。
所以说php是不可能直接获取到client的mac地址的，php要想得到client的MAC地址，得用到第三方的ActiveX或是用js等。PS：html">http://www.kenes.com.cn/MAC.html
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