Why am I getting this "Headers already sent" error?

Question

Possible Duplicate:
php headers already sent error

I have tried every thing to solve it, but this thig just wont go away.

Here is what I'm doing

if($query)
{
header("location:cool.php");
exit();
}

even though $query is executed, an issue with header.

thanks.

5000+ results for [“Headers already sent” error](http://stackoverflow.com/search?q=%E2%80%9CHeaders+already+sent%E2%80%9D+error%3F) — Gordon, May 24 '11 at 19:15

score 3 · Answer 1 · answered May 24 '11 at 19:18

3

ANY output will need headers sent, so any output will get you this error.

Common problems:

answered May 24 '11 at 19:18

Nanne

score 1 · Answer 2 · answered May 24 '11 at 19:14

1

You will get that error of you have any (I mean ANY) output beforehand

answered May 24 '11 at 19:14

Naftali

even with this?? echo mysqli_error($connect); – steve May 24 '11 at 19:17
@steve, do you have **ANYTHING** outputted to the page? – Naftali May 24 '11 at 19:17
1

yes, anything. any output. thats what the word **ANYTHING** means. it means anything – Naftali May 24 '11 at 19:19
Yes even with this it's possible. `echo mysqli_error($connect);` is not complete PHP code. Maybe you have a blank or carriage return right before the opening tag, for example: `_`. Or your code is included by other code and outputs s/t before including. etc. – Jürgen Thelen May 24 '11 at 19:20
@steve absolutely **ANY** output, e.g. any line of code starting with `echo` or any functions that might send output to the browser before your call to `header` will cause the error. – Brian Driscoll May 24 '11 at 19:20

score 0 · Answer 3 · answered May 24 '11 at 19:17

0

Ensure that $query is not outputting any data, other wise you'll get your error.

If not check to make sure NO data is being output before hand.

answered May 24 '11 at 19:17

DarkMantis

3 Answers3