是否可以获取唯一的ID，以区别于计算机和另一个计算机？

Question

I m new to php, but i know basics. still im learning in php.

In between gap, May i know, Is there possible to get unique id for differentiate from computer to another by using php?

Any suggestions would be highly appreciated.

Thanks.

Answer 1

A computer doesn't have a permanent unique id that can be read by php.

So depending on your requirement you can try IP address, but this is likely to change over time. So only for a short period of time you can use this information.

If you want to know for a longer period of time, when the user comes back to your page, the best way to do this is by assigning your own unique id in a cookie to the browser. This cookie will remember which computer is which.

Answer 2

You can set cookie to detect computer and also can detect IP. Now a days most of the ISPs uses dynamic IP address. Dynamic IP changes when client disconnect and reconnect internet connection. So cookie is the best way to detect a computer.

To set cookie use: setcookie('cookiename','cookievalue',time()+3600,'/','.example.com',0,1);

To retrive cookievalue: $_COOKIE['cookiename'];

To get IP: $_SERVER['REMOTE_ADDR'];