Driving me bonkers (simple PHP)

[noswad]

Hello.

Is it possible to take the end of a link e.g. .com/?id=123 and insert the '123' into the into a field of a registration page using PHP so I can log which users have referred others.

Thanks.

 

[xemiterx]

It is both possible and easy. If you had x.com/page.php?id=xx and

echo '<input type=hidden name=id value=' . $_GET['id'] . '>';

somewhere on page.php then you would have a hidden form element containing the id of the referer.

 

[noswad]

Thanks v much! :hehe:

 

[noswad]

Hi

I got this working at first by changing the code a little bit but for some reason I can't get it to work any more.

Could anyone help me please? Its driving me nuts.

David

P.S. The field doesn't have to be hidden although I would prefer it to be :hehe:

 

[Eric]

Merged your threads

Really isn't that hard either.. and would suggest the same as xemiterx.

<?php

$id = intval($_GET['id']);

echo '<input type="hidden" name="id" value="' . $id . '">';  

?>

What did you change? ^^ Should work just fine.

 

[noswad]

Excellent thanks. One little problem though -

If register.php?id=[text] the form is submitting '0' but if the id=[numbers] it's submitting correctly.

Any clues?

Thanks again

 

[Eric]

Ok, I was assuming the 'id' was just numerical, well, you could do the following:

<?php

$id = trim($_GET['id']);

if(preg_match("/([^a-z0-9]+)/i", $id))
{
    die('Invalid ID');
}

echo '<input type="hidden" name="id" value="' . $id . '">';  

?>

 

[noswad]

Thanks v much. V grateful.