Redirect to first page form

Hi there.  My WordPress site uses Gravity forms and on my site I have 2 forms.  I am passing a few parameters in the url from the first form to the second form such as email.

Now, I do not want the user to access this second page directly but only if they come via the first form page.  Is there something in functions.php or .htaccess (using http referer) or a conditional on that second form that will automatically redirect the user to that first form?

Thanks!
COwebmasterAsked:
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GaryConnect With a Mentor Commented:
Should be checking it is set first...

if(!isset($_SERVER['HTTP_REFERER'])||$_SERVER['HTTP_REFERER']!="http://localhost/tt.php"){
     header('Location: http://www.domain.com/page-1/');
}

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GaryCommented:
Use $_SERVER['HTTP_REFERER'];
Will give the previous page url
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COwebmasterAuthor Commented:
Okay, so what would I create and which file or page?
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GaryCommented:
On your second page

if($_SERVER['HTTP_REFERER']!="http://www.yoursite.com/yourpage.php"){
// what should happen if they haven't come from the previous page, redirect etc
}

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Note everything is passed in the REFERER string including any querystring params.
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COwebmasterAuthor Commented:
okay, on my wordpress site, I installed a php plugin so I can embed php code on the page.

I've set your code but need to place the redirect line of code in there.  What would that be?
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GaryCommented:
header('Location: '.$newURL);

if($_SERVER['HTTP_REFERER']!="http://www.yoursite.com/yourpage.php"){
     header('Location: newurl.php');
}
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COwebmasterAuthor Commented:
Okay, I tried but the page is not redirecting. I have:

<?php
if($_SERVER['HTTP_REFERER']!="http://www.domain.com/page-1/"){
header('Location: http://www.domain.com/page-1/');
}
?>
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COwebmasterAuthor Commented:
That worked, thanks!
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