PHP error: Warning: Cannot modify header information - headers already sent by

Question

Hi I'm wrinting a simple mail script in PHP

Of what that I found every one says its probably a whitespace in front of

But as you can see I can't find anything like the solutions on the internet in my code...

The error says : output started at /customers/e/e/5//httpd.www/email.php:1)

<?php
$to = '...@gmail.com';
$subject = $_POST['subject'];  
$message = $_POST['message'];  
$firstName = $_POST['firstName'];  
$lastName = $_POST['lastName'];  
$email = $_POST['email'];  
mail($to, "Contact www....com: $subject", "Gecontacteerd van de website: www.....com\nZender: $firstName $lastName\nBericht: $message", "From: $email");
header("Location:http://www.....com");  
exit;
?>

` ` is output that triggers sending the headers.... you can't have output before any additional `header()` in your script — Mark Baker, Feb 07 '14 at 10:11
So having edited your question.... what is line 3 of `email.php` because that's where the error is saying output was sent — Mark Baker, Feb 07 '14 at 10:13
I edited the file and remove the and and now the error refers to line 1. On this line I got the next code php — dg90, Feb 07 '14 at 10:18

Alireza Fallah · Accepted Answer · 2014-02-07T10:25:12.630

3

No output before sending headers

Functions that send/modify HTTP headers must be invoked before any output is made. Otherwise the call fails:

Warning: Cannot modify header information - headers already sent (output started at file:line)

Some functions modifying the HTTP header are:

Output can be:

Unintentional:
- Whitespace before <?php or after ?>
- UTF-8 Byte Order Mark
- Previous error messages or notices
Intentional:
- print, echo and other functions producing output (like var_dump)
- Raw <html> areas before <?php code.

Hint : for checking this, press crtl+u on the page to see the source, and check if the error is in line 2 , or there is a space before it.

edited Feb 07 '14 at 10:25

answered Feb 07 '14 at 10:11

Alireza Fallah

4,411
3
27
55

I removed the and as I clear saw it wasn't needed here... But I still got this error ... – dg90 Feb 07 '14 at 10:17
There is indeed a space before my error (if i check the page source), so what could cause this ? – dg90 Feb 07 '14 at 10:24
check what file is called before calling the current file, maybe its in that file – Alireza Fallah Feb 07 '14 at 10:27
how your script is being called? is it included in another file? – Alireza Fallah Feb 07 '14 at 10:32
yeah in the file email.php as In my post on the top. – dg90 Feb 07 '14 at 10:40
so check that file for any out put – Alireza Fallah Feb 07 '14 at 10:41
I don't know what could cause any output. It's the code in my top post 'My question' thats all. This is the page http://daangeudens.be/email.php – dg90 Feb 07 '14 at 10:45

score 0 · Answer 2 · answered Feb 07 '14 at 10:13

0

It's not just whitespace. You can't send any data at all to the client (i.e. anything outside <?php ?> tags) before you call header().

What you need to do is move your PHP code to the top of the file, before any of the HTML code (although in this case it looks like you're not actually expecting any HTML output from this script anyway, so you can probably get rid of it entirely).

answered Feb 07 '14 at 10:13

Peter Bloomfield

5,009
22
34

Yeah I removed the but still getting the same error – dg90 Feb 07 '14 at 10:15
Make sure there are no spaces or any other characters at all before the ` – Peter Bloomfield Feb 07 '14 at 10:19
Is PHP displaying any other errors/warnings/notices? – Peter Bloomfield Feb 07 '14 at 10:23

PHP error: Warning: Cannot modify header information - headers already sent by

2 Answers2

No output before sending headers

Linked