php dynamic url redirection using header location and sessions

Question

I am trying to figure out the best way to do this and probably totally over thinking it.

I need users to submit their email before they can get the page contents.

they don't need to confirm at this point just submit any email. So I created a simple form with an email field and submit it to my process page using "POST"

However, I need them to be redirected to a dynamic url after submitting their email.

So I want to be able to put a variable in the url to the page I want to redirect to like this:

http://myurl.com/provide_email.php?url=newpage.html

On page provide_email.php I put :

<?php
session_start();

session_register('url');

$_SESSION['url'] = $_GET['url'];

?>

and echo the ouput on the same page (just to test it). So, on the same page it shows:

newpage.html

Then on my process.php page I put:

<?php

session_start();

$dynamicurl = $_GET['url'];

if(empty($_GET))
    echo "No GET variables";
else
    print_r($_GET); 


$host  = $_SERVER['HTTP_HOST'];
$uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
$extra = 'folder1/folder2/';
header("Location: http://$host$uri/$extra/".$dynamicurl);


?>

However every time I submit the page it will not redirect to the url with the $dynamicurl variable.

I have also tried :

header("Location: http://$host$uri/$extra/$dynamicurl");

What am I doing the wrong?

The url has to be dynamic because I am creating the pages from a cms that ultimately the user will go to. I just want them to have to submit an email before they can get to each unique page.

$dynamicurl = $_GET['url']; why? you were trying to save the data into session variable, why are trying to get something from the query? session_register is DEPRECATED since php 5.3 — Cheery
– Cheery, Commented Feb 7, 2012 at 0:03
Have you tested what http://$host$uri/$extra/".$dynamicurl actually results in? — Pekka
– Pekka, Commented Feb 7, 2012 at 0:03
$dynamicurl = $_GET['url']; What si the use of this statement . I didn't find someting is passed in GET array , from query string — Kiran
– Kiran, Commented Feb 7, 2012 at 11:32

Eugen Rieck · Accepted Answer · 2012-02-07 01:13:30Z

0

Your debug statement is the problem:

if(empty($_GET))
    echo "No GET variables";
else
    print_r($_GET);

will start output, so the following header() cannot be honoured. I am sure your log is full of warning: Cannot set header, output already started

Use

if(empty($_GET))
    $message "No GET variables";
else
    $message=var_export($_GET,true);

and

echo $message;

AFTER the header() statement.

edited Feb 7, 2012 at 1:13

answered Feb 7, 2012 at 0:04

Eugen Rieck

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4 Comments

Jimmy Bluem Over a year ago

I put the debug statement just to see what was going wrong, but yes ...it is saying ... warning: Cannot set header, output already started . But if dont have the if statment it WILL redirect but only to the directory: http://myurl.com/folder1/folder2/ and never to the ending URL (newpage.html) If there is a better way to do this I am open. I just don't know any other way.

Jimmy Bluem Over a year ago

It shows me : Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in /home/webserver/public_html/test_site/process2.php on line 9 but line 9 is what I copied from your post line 9 and 11 are code highlighted as an error: if(empty($_GET)) $message "No GET variables"; else $message=var_export($_GET,true));

Jimmy Bluem Over a year ago

I found my answer .. but new user can not answer their questions apparently. [stackoverflow.com/questions/722836/… This seems to have worked... I removed the debug altogether and chnaged the code to this : header("Location: http://$host$uri/$extra/"."$_SESSION[url]"); [1]: stackoverflow.com/questions/722836/…

Eugen Rieck Over a year ago

I edited my answer: There was a superfluous bracket in line 9.

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