header function problem

[mshen]

I use header() function.I get the error

Cannot add header information - headers already sent by (output started at d:\program files\apache group\apache\htdocs\project1230\upload.php:1) in d:\program files\apache group\apache\htdocs\project1230\upload.php on line 83

but I do not use print statement before header().please help me tell me why.Thanks

[bastien]

this lets php send that blank line as some html to the client...therefore a header error...try ensuring no blank lines by either commenting them out or moving the code up one line

<?

//now some code

?>

[mshen]

I get error message in IIS like this.

CGI Error
The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are:

why?

[mshen]

I get the error message in Apache like this

Warning: Cannot add header information - headers already sent by (output started at d:\program files\apache group\apache\htdocs\project1230\editquestion.php:1) in d:\program files\apache group\apache\htdocs\project1230\editquestion.php on line 15

why it is different in different web server.

[Rohan_Hill]

Whatever line it says the output started on, have a look at that line. There'll be either a statement which makes output there, or some text outside of the <?php ?> tags.