PHP Header() function not redirecting

Question

I've got a problem with the header function

if ( ! isset($_SESSION['user']) ) {

   header('Location: login.php');

}

There is no echo before the if, the page is empty!

it doesn't redirect me. I've var_dump();'ed something in the If statement and it worked so the if is correct.

The php version is 5.6

1. Do you enter the if-statement? 2. Do you have any kind of output before this? Headers has to be called before any output is made to the browser (whitespace, HTML-coding, echo from PHP). — Qirel
– Qirel, Commented Oct 20, 2015 at 9:16
any output or HTML before the header function could make it fail. Also a so called Byte Order Mark (BOM) could let it fail.en.wikipedia.org/wiki/Byte_order_mark — Frank B
– Frank B, Commented Oct 20, 2015 at 9:19
turn on error reporting and set display_errors on 1 then if there are errors probably because you have sent some output to browser like white char then fix it — Robert
– Robert, Commented Oct 20, 2015 at 9:24

n-dru · Accepted Answer · 2015-10-21 06:35:54Z

5

You might have outputted something to the browser before header call. First check:

is there any html before php opening tag
is there any whitespace before php opening tag
is another php script included with echo before that script
is the coding utf8 with BOM?

Those are possible reasons of your error.

edited Oct 21, 2015 at 6:35

answered Oct 20, 2015 at 9:17

n-dru

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Comments

Abhishek Sharma · Accepted Answer · 2015-10-20 09:19:51Z

2

Try this code :-

<?php
if ( ! isset($_SESSION['user']) ) {
?>
<script>
    window.location = 'login.php';
</script>
<?php
}
?>

answered Oct 20, 2015 at 9:19

Abhishek Sharma

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1 Comment

Qirel Over a year ago

@Floes Take a look at the answer @n-dru posted instead. Most likely your header isn't working because of charset encoding, or having some kind of output before the header is called. This solution isn't optimal, as it won't work if JavaScript is disabled in the browser. Also, always remember to use exit; after calling a redirect, to stop the rest of the script from executing.

Rahul Gavande · Accepted Answer · 2015-10-20 09:22:10Z

1

You can also do following:

echo "<script>window.location = 'login.php';</script>";

answered Oct 20, 2015 at 9:22

Rahul Gavande

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Comments

Basheer Kharoti · Accepted Answer · 2015-10-20 09:57:05Z

-1

white space may cause the redirect change it to something like

if ( ! isset($_SESSION['user']) ) {

   header('location:login.php');

 }

edited Oct 20, 2015 at 9:57

answered Oct 20, 2015 at 9:21

Basheer Kharoti

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3 Comments

Qirel Over a year ago

That really doesn't matter, the issue is most likely either a session not started or output before the header is called. (Not my downvote btw).

Floeske Over a year ago

the session not started is true, there is no output before the header

Basheer Kharoti Over a year ago

@Floes Post your all page code so that it get's clear to everyone

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