Extracting anchor from url

I have a page with a bunch of anchor tags. eg:

<a name="tag1">
some text
<a name="tag2">
some more text

(In case you didn't know what anchor tags looked like!)

What I want to do is write to the database when a particular anchor is requested. So for

<a href="page.php#tag1">

We just go to the tag. But for

<a href="page.php#tag2">

We write to the database as well.

How do I do this? The # in the url doesn't seem to be available to $REQUEST and suchlike, nor to the $SERVER variables.
Any ideas?

How do I do this?
The # in the url doesn't seem to be available to $REQUEST and suchlike,
nor to the $SERVER variables.

How do we or you know this?
You have not provided any evidence.
Not a single line of PHP code.
Are you telling us the truth?

We do not know from your principal abstract discussion.
I want to know!!!!

echo ' this is PHP';
echo '$_GET['tag1];
echo '<br>will not work';

Halojoy is very helpfull ! But your question is abit incomplete...