AW: [PHP-WIN] session help

Hi Matt, this "headers already sent" thing may come with session handling and some other situations where you specify the behaviour realized via "header:" items in HTTP. Basically you have to make sure you don't output ANYTHING (not even a white space) before all header related stuff is handled. This is because HTTP requests have a header part sent en bloc at the top of a message and a body part to follow, the header part being good for all org (content type, charset, sessions, auth, ...) and the body part being what shall make up the content. PHP parses a HTML doc, executing everything it gets hold of top to bottom. The first content output to be generated triggers output of the headers known up to then. If it eases control flow (header info being calculated from content generated) you might want to use output buffering http://www.php.net/manual/en/ref.outcontrol.php to hold back page output thereby having the chance to put "afterthoughts" into your headers. -- Sven > -----Ursprüngliche Nachricht----- > Von: Matt Palermo [SMTP:mpalermo@vt.edu] > Gesendet am: Freitag, 25. April 2003 12:27 > An: php-windows@lists.php.net > Betreff: [PHP-WIN] session help > > I am having trouble using sessions to tell if a user is logged in or not. I > have attached some of the code I am using for it. > > <?php > > > $conn=mysql_connect($dbServer,$dbUsername,$dbPassword); > $dbase=mysql_select_db($db,$conn); > $check=mysql_query("SELECT requireaccount FROM calendar_config"); > $row=mysql_fetch_row($check); > > if($action=="logger"||$MyLogin=="true") { > session_start(); > $errors=0; > $usercheck=mysql_query("SELECT * FROM calendar_users WHERE > username='$uname'&&password='$pword'"); > while($row=mysql_fetch_assoc($usercheck)) { > $userid=$row[recno]; > $namer=$row[username]; > $emailaddy=$row[email]; > $priv=$row[priv]; > } > > if($userid=="") { > die("<center>You don't have and account, or your username and password don't > match.<br><a href='javascript:history.back()'>Go > > back and try again</a></center>"); > } > elseif($priv=="N"||$priv=="") { > die("<center>User: <b>$namer</b> must be approved by the calendar > administrator or have sufficient privileges to add events > > to the calendar.<br><a href='javascript:history.back()'>Go > Back</a></center>"); > } > else { > if($MyLogin!="true") { > $_session["MyUserID"]=$userid; > $_session["MyLogin"]="true"; > } > } > //then the rest of the code comes after this. > > When I go to access this, I get the following: > > Warning: session_start() [function.session-start]: Cannot send session > cookie - headers already sent by (output started at C:\Program Files\Apache > Group\Apache2\htdocs\calendar\header.php:5) in C:\Program Files\Apache > Group\Apache2\htdocs\calendar\add_event.php on line 10 > > Warning: session_start() [function.session-start]: Cannot send session cache > limiter - headers already sent (output started at C:\Program Files\Apache > Group\Apache2\htdocs\calendar\header.php:5) in C:\Program Files\Apache > Group\Apache2\htdocs\calendar\add_event.php on line 10 > > Anyone know why? > > Matt > > > > > -- > PHP Windows Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php >