How do you get the 'referer' header in PHP?

Question

I want the the url of the page from which a request has been made. How can I do that in PHP?

Accepted Answer

The refer(r)er can be found in the `$_SERVER` global variable. Please note that sending the refer(r)er is completely optional and a user-agent can simply decide to not send the refer(r)ing url.

```
$_SERVER['HTTP_REFERER']
```

How do you get the 'referer' header in PHP?

Solution

Problem