Header Redirect

lerro

I need to use header to redirect to another url, but i would prefer to use relative and not absolute urls.

How can i achieve this?

The code i have so far is

header("Location: http://" . $_SERVER['SERVER_NAME']
. dirname($_SERVER['PHP_SELF'])
. "/" . $relative_url);

But does it work if say, i specify relative url as

$relative_url = ../folder/filename.php

and then i use the header function

header("Location: http://" . $_SERVER['SERVER_NAME']
. dirname($_SERVER['PHP_SELF'])
. "/" . $relative_url);

Also, how can i make the http part to be auto-detected, incase the url starts with "http" or "https", as the above would only be useful for http.

bradgrafelman

lerro;10942410 wrote:
But does it work if say, i specify relative url as

$relative_url = ../folder/filename.php

Using "../" in a URL appears to resolve correctly from my tests, yes, though note that the example code you posted has parse errors.

lerro;10942410 wrote:
Also, how can i make the http part to be auto-detected, incase the url starts with "http" or "https", as the above would only be useful for http.

Something like this should do the trick:

$protocol = 'http' . (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off' ? 's' : '') . '://';

lerro

Thanks, what parse errors does the code have?

also, how do i clear stuff that is in php memory as when i try to make changes, my form just keeps looping even when changed details are saved. It doesn't display what i would expect to see, even when i do

echo "hello world";

as the only php output on the page, the form that Posts data to this page still behaves as if the redirect header was till active and just keeps refreshing.

The header was previously set up to redirect back to the login page if there was no form input or a field was missed.

bradgrafelman

Well since it's a string, you have to wrap the path in quotes (just like any other string in PHP).

EDIT: And once you add the quotes, there's also the missing semicolon, of course.

lerro

Is this correct?

$relative_url = "../folder/filename.php";

$protocol = 'http' . (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off' ? 's' : '') . '://';

header("Location:" $protocol . $_SERVER['SERVER_NAME'] . dirname($_SERVER['PHP_SELF']) . "/" . $relative_url);

echo "hello world";

as the only php output on the page, the form that Posts data to this page still behaves as if the redirect header was till active and just keeps refreshing.

The header was previously set up to redirect back to the login page if there was no form input or a field was missed.

halojoy

It is your Browser that remembers in History. Nor PHP.
There are stored history pages in PC memory.

Firefox:
Options->Privacy
I have marked
'Clear history when Firefox closes'

This means that if I close down all Firefox windows and restart Firefox
then all history is deleted. And there are no old pages.

You also can delete all history manually, without closing down Firefox:
Options-> Clear Recent History (Ctrl+Shift+Delete)

In some Browsers this setting is called Cache instead of History

lerro

Thanks, i tried the instructions but it's still happening.

I will shut down my system then try later and see if the problem resolves.

halojoy

lerro
Then your issue is not the browser history.

I would guess this.

It is important to put one exit(); after header('location...');
Many think a php script ends always after a header redirect.
But this is not always the case!

If we do not put an exit(); (same as die()) then very strange things might happen.

Here is what I always do:

<?php


header( 'location: index.php' ); //redirect
exit(); // ends this php script!!!!!!!

?>

lerro

Thanks for this,

I will try using that exit() function