php headers already sent error

Question

I have a single php file, with this code in it:

<?php header("Location: somepage.php"); ?>

Absolutely no spaces before or after the php opening or closing tags and I am getting the

Warning: Cannot modify header information - headers already sent by (output started at C:\ ... \test.php:1

Usually when I get this error, the 1 is the line number of the problem, but in this case line one doesn't have any extra whitespace. I only have this code on the page and I am not including any other files.

I'm using xampp on windows xp. Any ideas what's going on or how I can track down what's really causing the problem.

Thanks

Answer 1

Chances are that you have what's known as a BOM (Byte Order Mark) in the file. Depending on what editor you're using, you'll need to turn off adding the BOM...

Answer 2

If you are sure it is not a BOM causing the error, check your httpd.conf and any .htaccess files if the prepend any other files. Look out for something like this:

<FilesMatch "\.(html?)$">
php_value auto_prepend_file /server/path/to/my/www_root/subdir/file.ext"
</FilesMatch>

Also check your PHP.ini: http://de.php.net/manual/en/ini.core.php#ini.auto-prepend-file

Answer 3

Try to copy / paste your content to another new file using Notepad

Answer 4

Try using WAMP, it doesnt show this error, make sure you donot have spaces before or after the code. For that, if you are using notepad ++ or editplus, go to format and select unix formatting and things should work fine.

OR

try placing this at the top of your page:

<? ob_start(); ?>

then at the bottom of the page place this line of code:

<? ob_flush(); ?>