Tech-Recipes - Latest Comments in Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Charlies — Thu, 02 Jul 2009 16:43:25 -0000

I am not getting this error on my local PC, but when I upload the scripts to the hosting provide I get this error. How can I set my local machine to display the same error

Cheers

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Emmanuel Afonrinwo — Sun, 28 Jun 2009 08:40:32 -0000

Thanks a lot, after reading and carefully looking through the codes paying attention to your advice theproblem was resolved.

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

dinesh — Sat, 20 Jun 2009 07:41:04 -0000

Make sure there is no white space outside of the php start and end tags

This is really a culprit.
Thanks for help.

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Leandro — Fri, 19 Jun 2009 11:07:28 -0000

I had an include with two blank lines after the ?> in that include... I deleted those blank lines and It works perfectly!

Thanks!

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Jamie — Thu, 11 Jun 2009 15:47:56 -0000

Ugh. Of course!! My problem was, as you said, hiding in plain site. I was echoing a file upload verification right before calling header(), and I didn't even notice it.

Thanks for the easy instructions!

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Mithus — Thu, 11 Jun 2009 00:59:14 -0000

That really great....thanx.....sooo mch....

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

neoniflor — Fri, 05 Jun 2009 23:19:12 -0000

That was fun..... whitespace really where a problem... thanks

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Anonymous — Thu, 04 Jun 2009 05:49:02 -0000

UTF-8 should work fine on any OS. It's the BOM (Byte Order Mark) that causes the problem, but since UTF-8 always has the same byte order it doesn't need a BOM. See http://unicode.org/faq/utf_bom.html#bom5

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

mark — Wed, 27 May 2009 18:56:38 -0000

Uh, yeah, that's nice, but....

what if you need your PHP file to be UTF8 because you need non-ANSI characters in your script defined strings?

My UTF8 .php file works fine on Windows 5.2.5, but barfs on a linux build of same version.

Sigh.

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Andy — Sun, 17 May 2009 07:59:36 -0000

Legendary stuff... this article just saved my sanity. A white space after the close php tag in an 'include' file caused my hours of frustration.

Thank you!

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

bapo333 — Thu, 14 May 2009 08:14:32 -0000

thnks.........
i have been working on the same for the past 5 days........... the error i had was a space before PHP tag..

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

thejimgaudet — Fri, 08 May 2009 12:07:00 -0000

U DA MAN... Removing DOM fixed it...

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

IMQ — Tue, 28 Apr 2009 04:07:00 -0000

this error will be thrown if u have any white spaces or any print or echo above header call.
There should be no print , no echo and no spaces before or after header statement.

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Lito — Tue, 28 Apr 2009 03:52:25 -0000

Warning: Cannot modify header information - headers already sent by (output started at /home/misaghi/public_html/config.php:47) in /home/misaghi/public_html/login_process.php on line 79

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

manuel — Thu, 23 Apr 2009 18:14:27 -0000

how can modify display_error in php script ?

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

MetalGarurumon — Thu, 19 Mar 2009 04:55:16 -0000

Thanks! It works now :)))

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

RORO — Mon, 16 Mar 2009 03:41:36 -0000

This did it! THANKS SO MUCH!! Nothing else worked and I tried it all!

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Fr — Thu, 26 Feb 2009 08:33:05 -0000

Actually, there are some solution, problem is well documented on link:
http://php.net/manual/en/function.header.php

It is related to earlier versions of PHP, or to setup in php.ini
I've put on the very first line:
<?php
ob_start();
session_start();
?>
Now, everything works fine, i-e you can have more than one header in your code.

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

dominic — Thu, 26 Feb 2009 07:55:59 -0000

This helped me to some my problem. Where i was trying to generate a xml file using php.

Thanks

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

dave — Wed, 25 Feb 2009 12:49:29 -0000

wwwwwwwwwwwwwoooooow thanks sir problem solved,, stupid white space

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

qmchenry — Thu, 19 Feb 2009 13:15:34 -0000

Your database query may not be returning a valid result. It's good practice to make sure the result returned from your mysql_query command is valid.. something like:

if (!$result) {
die('Invalid query: ' . mysql_error());
}

Dumping the error message may help in this case, too.

Good luck!

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Sachin — Thu, 19 Feb 2009 11:36:19 -0000

hi
please help me.. please please please.
please take a look at the following script:
it is giving the following errors
---------------------------------------------------------------------------------------
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/compkcom/public_html/cmpanel/check_login.php on line 11

Warning: Cannot modify header information - headers already sent by (output started at /home/compkcom/public_html/cmpanel/check_login.php:11) in /home/compkcom/public_html/cmpanel/check_login.php on line 19
---------------------------------------------------------------------------------------
here goes the php script
----------------------------------------------------------------------------------------------------
<?php session_start();
if((isset($_POST['username'])&&$_POST['username']!="")&&(isset($_POST['password'])&&$_POST['password']!="")){
$error='';
$conn = mysql_connect('localhost','compkcom_care','ptk')or die('Could not connect to MySQL database. ' . mysql_error());
mysql_select_db(SQL_DB,$conn);
$query = "SELECT COUNT(username) AS record FROM admin WHERE username ='" . $_POST['username']."' AND password = '".$_POST['password']."'";
$result = mysql_query($query);
$row = mysql_fetch_array($result);
if($row['record']==1){
$_SESSION['user_logged'] = $_POST['username'];
$_SESSION['user_password'] = $_POST['password'];
header("location:welcome.php");
}
else{
$error .="Please+Enter+Correct+Username+and+password%21%0D%0A";
header("location:index.php?&error=".$error);
}
}
else{
$error .="Please+Enter+the+Username+and+password+First%21%0D%0A";
header("location:index.php?&error=".$error);
}
?>:
----------------------------------------------------------------------------------------------------
this script is running fine on my local windows server but giving the above mentioned errors on my linux hosted server..
Please help me...
Thanks..

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Dan — Fri, 06 Feb 2009 10:04:22 -0000

It did work! Colour me amazed! Ta!

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Klaus — Tue, 03 Feb 2009 10:43:00 -0000

Thanks, helped me a lot.
Amazing what some additional unnoticed whitespace can cause havoc
sometimes.

Re: Solve PHP error: Cannot modify header information - headers already sent | PHP programming | Tech-Recipes

Fr — Tue, 03 Feb 2009 06:21:39 -0000

Strange issue, I've removed header completely from html, actually, completely <html> tags, and only with
<?php
......
header("location:../first.php");
?>
then it is working properly.
I've got a line with echo before the header, and got the same warning - Cannot modify header information - headers already sent.
This is happening on a linux environment, on windows (+Apache+mysql) I've got no such a messages, well, I didn't compared those two php.ini properly.
Anyway, thanks for help.