error warning

[jinchiruki]

hi all..
i had this problem
when i click submit at a form..this things comesout

Warning: session_start(): Cannot send session cache limiter - headers already sent

but the data submitted available in db table.

whats the error actually???
fyi,this mini system have login..but for the form,i didn't set user need to login.

[johnsquibb]

you'll get that warning when trying to call session_start after outputting content to the browser with something like echo or print, or if you have embedded PHP that calls a session_start following HTML content.

The reason your DB update still works is because the error is just a warning. Warnings do not halt the compiler, they just spit out the warning text and continue.

learn all about sessions h ere