php tech with wordpress

[Xarzu]

I have a question about referrals for my wordpress blog. This might be more of a PHP question than a wordpress question. After I manage to add the field to the sign-up page where the user can add a referral ID, how do I add the functionality where that referral ID can be inserted automatically in the sign-in page? I know that in PHP you can add strings at the end of a URL like?this or like?this=that but how does one make sure that this translates to a string being added to a field in the web page?

[hakre]

You get access to those parameter via $_GET in PHP. $_GET['this'] will contain the strong "that" then.

<input type="hidden" name="referralid" 
    value="<?php echo htmlspecialchars($_GET['referralid'], ENT_QUOTES); ?>"> 

This is all in the docs: http://www.php.net/manual/en/languag...s.external.php

This is just a very basic example but it might be helpful to lead you some way. If real(tm) money is involved, I would advice you to get in touch with someone you can discuss your problem with more details and who can teach you about the things you need to learn. I just suggest that, because this can have security implications and you business processes might need some futher thinking, but this is out of the scope for my answer.

[andreasnrb]

The WP way: For escaping in attributes you should use esc_attr_e($value) it echos also.
<input type="hidden" name="referralid" value="<?php esc_attr_e($_GET['referralid']) ?>">

[Xarzu]

The sign-up page, in wordpress, where I want to have the referral space, uses a plug-in to add fields. Unfortunately, the referral space is not one of the fields. How do I add a custom field seperate from the plug-in.

I think solving this problem might be complex. I wonder where I should start.