警告：无法修改标头信息。 找不到错误[重复]

Question

This question already has an answer here:

• How to fix “Headers already sent” error in PHP 11 answers

I'm using a login-script and on my developmachine it worked perfectly but when I moved it to my webhost it stopped working.

The code can be viewed here: http://beta.yapaste.com/fm

The error I get when I login is

Warning: Cannot modify header information - headers already sent by (output started at /*/*/*/*/*/*/login.php:10) in /*/*/*/*/*/*/inc/login.php on line 43

But I can't find the error.

Thanks for answers, Victor.

Edit: Found the error, I included the file that I've got on yapaste in another file so the php-code wasent first.

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Answer 1

On line 10 of login.php something is sent to the browser (white space between ?> and <?PHP tags count), at which point headers must be sent to. This triggers a warning when you try to then add more headers after this, on line 43.

You need to have a look at line 10 and prevent the output being sent, or use output buffering - your previous host could have had this on by default which might explain why it no longer works...