Track where users come from in PHP?

Question

Is it possible to find out where the users come from? For example, I give a client a banner, and the link. The client may put the banner/link to any website, lets say to a site called www.domain.com.

When the user click the banner, is it possible to know where he coming from(www.domain.com)?

Answer 1

Have a look at the HTTP_REFERER variable. It will tell you what site the user was on before he came to your site.

Answer 2

Yes. You give the client a unique URL, like www.yourdomain.com/in/e10c89ee4fec1a0983179c8231e30a45. Then, track these urls and accesses in a database.

The real problem is tracking unique visitors.

Answer 3

See

 $_SERVER["HTTP_REFERER"]

Although that can't always be trusted as it's set by the client but you may not care in your case.