Talk about how php gets Client MAC

From: amxku.net

At first, I thought that php could completely obtain the mac of the client, which is ridiculous. Finally, it was despised by yunshu.

This is totally impossible. Php cannot directly obtain the mac of the client.

First, php is completely interpreted and executed on the server, so it is impossible to directly obtain the MAC address of the browser Nic, because the browser does not send MAC by default.

If it is explained from the perspective of data packets, MAC headers are usually included during transmission within the LAN, and the routes are constantly forwarded. In fact, each level-1 device is stripped from a layer, at the end, only the TCP/IP data header and data are left. MAC can only be transmitted in the physical layer of the network. (That is to say, the client's mac address information cannot be transmitted on the public network. The public network's MAC information is the last hop device's interface MAC. See Hell-Phantom's comment)

The http protocol is also impossible. Mac addresses cannot be included in http requests. Let's take a look at the instructions on the http protocol.

Therefore, php cannot directly obtain the mac address of the client. To obtain the MAC address of the client, php must use a third-party ActiveX or js. PS: html "> http://www.kenes.com.cn/MAC.html