PHP Error

Vinoth · August 03, 2004, 10:14:31 AM

Warning: Cannot modify header information - headers already sent by (output started at /home/webhosts/public_html/Index/look.php:4) in /home/webhosts/public_html/Index/look.php on line 40

What does this warning mean?? and can i overcome it.

kegobeer · August 03, 2004, 10:25:44 AM

There could be a number of things causing it. Check for extra carriage returns after ?>. A google search for "Warning: Cannot modify header information - headers already sent by" should give you more help if that doesn't solve your problem.

Ben_S · August 03, 2004, 11:51:47 AM

It means what it says, you are trying to send HTTP headers out on line 40 of look.php but headers being headers have to come before any other output and you are sending output to the browser on line 4, like it says.

Tomer · August 03, 2004, 12:04:01 PM

Check if you are using any header() functions after output.

z3r0_un0 · August 03, 2004, 05:37:45 PM

Quote from: Tomer Dean on August 03, 2004, 12:04:01 PM
Check if you are using any header() functions after output.

Yes, check if you're using header() functions.

If you're doing it, you must put it in the first line of the document, before starts the html.

Tomer · August 03, 2004, 05:43:42 PM

Quote from: z3r0_un0 on August 03, 2004, 05:37:45 PM
Quote from: Tomer Dean on August 03, 2004, 12:04:01 PM
Check if you are using any header() functions after output.

Yes, check if you're using header() functions.

If you're doing it, you must put it in the first line of the document, before starts the html.

It doesnt have to be on the first line, just before output.

z3r0_un0 · August 04, 2004, 05:33:59 PM

Quote from: Tomer Dean on August 03, 2004, 05:43:42 PM
It doesnt have to be on the first line, just before output.

I say it, because the header() function have to be before of head tag (<head>).

[Unknown] · August 05, 2004, 09:23:08 PM

Quote from: z3r0_un0 on August 04, 2004, 05:33:59 PM
Quote from: Tomer Dean on August 03, 2004, 05:43:42 PM
It doesnt have to be on the first line, just before output.

I say it, because the header() function have to be before of head tag (<head>).

Not specifically; rather, the header() function cannot be called before anything is output. For example:

Code Select

<html>
<?php header('Test: test!!'); ?>

Would not work. This, however, would:

Code Select

<?php header('Test: test!!'); ?>
<html>

Or this:

Code Select

<?php ob_start(); ?>
<html>
<?php header('Test: test!!'); ?>

But, it's not the <html> or <head> element's fault; it's any output:

Code Select

Text.
<?php header('Test: test!!'); ?>
That would also generate an error.

-[Unknown]

Vinoth · August 07, 2004, 10:34:35 AM

Thanx for the help , all.

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PHP Error