Getting the referer path

[owainhunt]

How can I get the full path of the referrer page? eg to return the user to the original page after a form has been processed by another script. this form is in an include and appears on every page of the site:

page.php is the page with the include in it.
engine.php is the script that is called when the form is submitted.
How do I return the user to 'page.php'?

[Anon]

page.php

<form action="engine.php" method=post>
all the input HTML codes here

</form>

engine.php

/// do the database insertion and all the mails functions here, then

if successs - do this
header("Location:http://domain.com/post.php");
exit();

if fail - do this
header("Location:http://domain.com/fail.php");
exit();

[owainhunt]

Yes but in that example the page to return to is hard-coded into the script. It needs to be dynamic. I tried sending the path like this:
<input type=hidden name=url value="<?php echo $PHP_SELF;?>">
but it didn't work.