$_GET URL variable not working

Greetings...

I've got a weird issue here.  I'm passing a URL in a variable called, URL to another page to be redirected.  For some reason the $_GET function isn't picking up all of the variables.  Here is the URL that is being passed:

URL=http://www.mydomain.com/asp/detail.asp?1=&p=297&o=1

Now here is my code to grab the variable:

$redirect = $_GET['URL'];
header ('Location:'.$redirect);

When you echo $redirect all you get back is:
http://www.mydomain.com/asp/detail.asp?1=

It seems to stop right after the = sign.  Any ideas?  I'm also passing some other variables such as an ID and I can get that just fine.
cwilkeyAsked:
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snoyes_jwCommented:
er, no.  You'll need to call urlencode on the page before.  The one that generates URL in the first place.
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snoyes_jwCommented:
You'll need to urlencode the value for URL before you pass it on to this page.  Otherwise, how does PHP know that those variables belong with the URL variable, and not just a part of the rest of the variables?
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cwilkeyAuthor Commented:
Yikes...so here in lies the problem.  Not every URL passed will have variables in them.
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aib_42Commented:
What if you also wanted to pass p=296?

something.php?URL=http://www.mydomain.com/asp/detail.asp?1=&p=297&o=1&p=296 ? Does this look OK to you? Where does the URL end and p start?

You cannot have '&' or other special URL characters inside a variable being passed via GET.
You can make a simple form with
<form method="get" action="something.php"><input type="hidden" name="URL" value="http://www.mydomain.com/asp/detail.asp?1=&p=297&o=1"><input type="submit"></form>
and see how the browser passes the URL to the PHP script.

It will be URL-encoded, as per urlencode(). So if you're manually passing the URL, you should URL-encode it as well.

$foo = urlencode("http://www.mydomain.com/asp/detail.asp?1=&p=297&o=1");
$link = "something.php?URL=$foo&p=296";
echo "<a href=\"$link\">...</a>";

will yield a URL like:

something.php?URL=http%3A%2F%2Fwww.mydomain.com%2Fasp%2Fdetail.asp%3F1%3D%26p%3D297%26o%3D1&p=296

And this time you will be able to use $_GET['URL'] properly.
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cwilkeyAuthor Commented:
Creating a form will isn't an option.  I've created a banner management system that passes it's URL to a page so the database can record it's impression/clicks.  It then redirect to the URL based on the domain passed.

So, I tried:

$redirect = urlencode($_GET['URL']);
header ('Location:'.$redirect);

And I got: http%3A%2F%2Fwww.spiritlakehomes.com%2Fasp%2Fdetail.asp%3F1%3D

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cwilkeyAuthor Commented:
That's it.  That did it.  Thank you sir...or mam!
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snoyes_jwCommented:
You're welcome.
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