[SOLVED] Help with a concept

[herghost]

Hi all,

 

I am wondering how you would make a form with a referral box that autofils if the user has been directed from a page by a referrer.

 

I am guessing that you would have something like www.mypage.com/myform.php?ref=username

 

How would I get the username and auto display it in my form field? If I could get it and store it as a variable then how would I avoid an error if no referral is given?

 

Hope this makes sense

 

Thanks!

[ram4nd]

use $_GET['ref']

what error?

[Alex]

use $_GET['ref']

what error?

 

He might be referring to the notice thrown if you use an undefined index in the $_GET superglobal, or any variable for that matter, which you might not see depending on your error reporting level. To get around this use isset()

[herghost]

Well say you had in your form

 

<input name="ref" type="text" value="<?php echo $ref" />

 

but no ref existed as the user was not referred and is just a browse in user then you would get an error because the variable is undefined would you not? How would you go about avoiding this?

 

EDIT = too slow!

 

So using isset, how would you code this?

 

Something like isset($ref) = true?

 

Have not used isset before!

[mrMarcus]

<input name="ref" type="text" value="<?php echo ((isset ($_GET['ref']) || (!empty ($_GET['ref']))) ? htmlentities ($_GET['ref']) : ''); ?>" />

[herghost]

Fantastic Many thanks to you all