mysql - include and header php advice -

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im building first dynamic site. have index.php based on whether following session variable true or false

if($_session['loggedin']) {    include 'logged-in/logged-in.php'; } else{ include 'not-logged-in/not-logged-in.php'; }

the not-logged-in.php displays forms can either login or register calls function within included php file. if login() function validates via login via mysql sets 

$_session['loggedin'] = 1; header("location: ../index.php");

i error...

warning: cannot modify header information - headers sent (output started @ //index.php:8) in //not-logged-in/not-logged-in.php on line 5

sorry '*' out url keep project private. come simple graphics programming background , new me. tips or advice appreciated.

this error caused having output browser, either echo, print, etc. before call header().

personally wouldn't use session variable store whether user logged in or not because may want disable user, , if they're logged in still have access until session expires. store username , hashed password in session , re-run login procedure, using these details, each page.


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