PHP header function is not working

Question

The following header function is not working. I ma trying to go to login if the user is not logged in -

    <?PHP
    if (logged_in() === false) {
    header('Location: login.php');
    }
    ?>

However if I do -

    <?PHP
    if (logged_in() === false) {
    echo"No user is logged in";
    }
    ?>

It does echo it and I can see that it says no user is logged in

It is basically just checking if there is a user logged in

    function logged_in() {
    return (isset($_SESSION['user_id'])) ? true : false;
    }

wild guess, logged_in() does some output, and header() then issue a warning and doesn't work — user180100
– user180100, Commented Jun 7, 2013 at 5:14
You need to include session_start(); as your first line of code after <?php in every affected/used file. Give that a try. — Funk Forty Niner
– Funk Forty Niner, Commented Jun 7, 2013 at 5:23
@Fasilkk You should get the credit for this. Post it as an answer and I'll upvote it. — Funk Forty Niner
– Funk Forty Niner, Commented Jun 7, 2013 at 5:43

GautamD31 · Accepted Answer · 2013-06-07 05:27:34Z

2

Try to put exit() or die() after the header like

  if (logged_in() === false) {
      header('Location: login.php');
      exit();    //or die();
  }

But makesure that your login.php should be in the same folder

edited Jun 7, 2013 at 5:27

answered Jun 7, 2013 at 5:15

GautamD31

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2 Comments

avink Over a year ago

Thanks for the help. I figured it out I needed the ob_start and ob_end_flush

Funk Forty Niner Over a year ago

@AvinashKunaparaju Ahem, Fasil kk figured it out ;-)

Fasil kk · Accepted Answer · 2013-07-03 05:38:36Z

1

Make sure that there is no output(white-space also) in your code.

you can use ob_start() and ob_end_flush() to clear out-put.

<?php ob_start();

 // code 

ob_end_flush(); ?>

edited Jul 3, 2013 at 5:38

answered Jun 7, 2013 at 5:45

Fasil kk

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3 Comments

Daedalus Over a year ago

Although this solved the problem, it'd be good to explain why, for future visitors viewing this question.

Funk Forty Niner Over a year ago

@Daedalus Like 90% of the questions with answers on SO, most post a link to PHP.net anyway, so it's irrelevant. Give the guy a break.

Fasil kk Over a year ago

@Daedalus... I added small explanation too.. I think that is enough to understand for all.

Thomas · Accepted Answer · 2013-06-07 05:23:55Z

0

You probably need to include the fully qualified domain and path to the new url. There is a note on the official documentation for the header function indicating as such.

Note:

HTTP/1.1 requires an absolute URI as argument to » Location: including the scheme, hostname and absolute path, but some clients accept relative URIs. You can usually use $_SERVER['HTTP_HOST'], $_SERVER['PHP_SELF'] and dirname() to make an absolute URI from a relative one yourself:

This note also contains the following code sample.

<?php 
/* Redirect to a different page in the current directory that was requested */ 
$host  = $_SERVER['HTTP_HOST']; 
$uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\\'); 
$extra = 'login.php';
header("Location: http://$host$uri/$extra"); 
exit; 
?>

answered Jun 7, 2013 at 5:23

Thomas

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2 Comments

Barmar Over a year ago

Every browser supports relative URLs, and W3C or IETF is planning on changing the spec to say that it's allowed.

Barmar Over a year ago

See stackoverflow.com/questions/8250259/…

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