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I cannot start a session or edit headers

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Whenever I put "session_start();" in my php codes, I always encounter these warnings:

 

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at W:\www\easyboard\logout.php:4) in error location

 

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at W:\www\easyboard\logout.php:4) in error location

I also cannot store variables in $_SESSION...

 

and when I put "header("Location: url");", I encounter

Warning: Cannot modify header information - headers already sent by (output started at W:\www\easyboard\logout.php:4) in error location

Has it got to do with Uniform Server?

 

If possible, someone please explain this script to me, or recomend another authentication script...

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Thanks. I had big trouble setting the $_SESSION variable.

 

Is it possible not to include the header.php file?

 

Ok. Basically, I want to create a minimalistic PHP and MySQL message board.

Needed information:

login id

password

email

 

Available functions/preferences:

password change

post message/poll/survey

edit own message/poll/survey

search by date, keywords etc.

board colours (for self)

display names

 

Targeted use: class noticeboard

 

Any php+mysql scripts out there so minimalistic?

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