Redirection if a condition is met

[aeldaly]

I know this topic has been discussed a few times here and also on
php.net, but I cannot find an answer to my specific problem. I check to
see if a user is logged in before serving admin.php like so:
<?php
session_start();
if (!isset($_SERVER['username']) or !isset($_SERVER['password'])) {
header("location:http://linux-place.com");
exit;
}
?>
These are the very first lines in the file. It works perfectly. The
problem is that I would like to output a message like "Please login
first before accessing the administration panel". How can I do that
without getting the headers already sent error?

Thanks,
Ahmed El-Daly

[chotiwallah]

ae*****@gmail.com wrote:

I know this topic has been discussed a few times here and also on
php.net, but I cannot find an answer to my specific problem. I check to
see if a user is logged in before serving admin.php like so:
<?php
session_start();
if (!isset($_SERVER['username']) or !isset($_SERVER['password'])) {
header("location:http://linux-place.com");
exit;
}
?>
These are the very first lines in the file. It works perfectly. The
problem is that I would like to output a message like "Please login
first before accessing the administration panel". How can I do that
without getting the headers already sent error?

Thanks,
Ahmed El-Daly

i generally use a 3 step procedure:

1. check if headers are sent, if not use header to redirect

2. if headers are sent already, print a javascript relocation routine

3. as a fallback if javascript is disabled, print a normal link

micha

[Jean-Baptiste Nizet]

Is http://linux-place.com the URL of the login page?
If it is, why not passing the message to this URL (or a message key):

<?php
session_start();
if (!isset($_SERVER['username']) or !isset($_SERVER['password'])) {

header("location:http://linux-place.com?messageKey=loginBeforeAdminPanel");
exit;
}
?>

and, in the login PHP page :

<?php
$message = getMessageFromKey($_GET["messageKey"]);
// display the message
// display the login form
?>

You should even pass the URL of the page requested before the redirect
to the login page, and redirect to this URL once the login is
successful. (Or put this URL in the session before the redirect to the
login page, and redirect to this URL after the login is successful).

JB.

[aeldaly]

YES!!! Thanks JB. That is exactly what I am going to do.