PHP cookies & sessions

Question

I keep getting this error when going into another page while logged in:

Warning: session_start() [function.session-start]: Cannot send session cache limiter -      headers already sent (output started at     /home/content/63/10400363/html/SeniorProject/update.php:5) in      /home/content/63/10400363/html/SeniorProject/update.php on line 6

Also, whenever i put call update.php directly (while not logged in), it's not supposed to show the form, it's supposed to direct you back to the login page. I spent hours on this and cant figure out what im doing wrong. ANY help would be appreaciated.

Here's my code: LOGIN.PHP

<?php 
session_start(); 
require("passwords.php");
?>
<?php
function redirect(){    
    echo '<META HTTP-EQUIV="Refresh" Content="0; URL=update.php">';    
    exit;    
};
if ($_POST["ac"]=="log") { /// do after login form is submitted  
     if ($USERS[$_POST["username"]]==$_POST["password"]) { /// check if submitted 
    // username and password exist in $USERS array 
          $_SESSION["logged"]=$_POST["username"]; 
     } else { 
          echo 'Incorrect username/password. Please, try again.'; 
     }; 
}; 
if (array_key_exists($_SESSION["logged"],$USERS)) { //// check if user is logged or not  
     echo '<center><font color="red">You are logged in.</font></center>';
     echo '<center><font color="red">You will be redirected to the correct page in     3 seconds.</font></center>';
     echo "Your session is running " . $_SESSION["logged"];



} else { //// if not logged show login form 
     echo '<form action="login.php" method="post"><input type="hidden" name="ac"     value="log"> '; 
     echo 'Username: <input type="text" name="username" />'; 
     echo 'Password: <input type="password" name="password" />'; 
     echo '<input type="submit" value="Login" />'; 
     echo '</form>'; 
 }; 
?>

UPDATE.PHP

<?php
session_start();  
require("passwords.php");
check_logged();
?>
<?php


'<p align="center">
<h1>UPDATE RECORDS</h1>
<form method="post" action="doupdate.php">
    <fieldset>
    <legend> Update Form: </legend>
    <font color="red">PROF. ID*</font> <br>
    <input name="id" type="text" size="50" /><br>
    <font color="red">BUILDING* </font> <br>
    <input name="building" type="text" size="50" /><br>
    <font color="red">ROOM NUM* </font> <br>
    <input name="roomNum" type="text" size="50" /><br>
    <font color="red">OFFICE HR* </font> <br>
    <input name="officeHr" type="text" size="50" /><br>
    <font color="red">SPECIAL REMARKS </font> <br>
    <input name="special" type="text" size="50" /><br><br>
    <input name="submit" type="submit" value="submit" />

    </fieldset><br><br>
</form>
<font color="red">* REQUIRED FIELDS<br>
OFFICE HOURS UPDATED IN FOLLOWING FORMAT:<br>
M/TH 00:00-11:11</font><br>

</html>';
echo "Your session is running " . $_SESSION["logged"];
?>

PASSWORDS.PHP

 //OMITTED PASSWORDS ARRAY HERE
 //OMITTED PASSWORDS ARRAY HERE
 //OMITTED PASSWORDS ARRAY HERE
 //OMITTED PASSWORDS ARRAY HERE


function check_logged(){ 
     global $_SESSION, $USERS; 
     if (!array_key_exists($_SESSION["logged"],$USERS)) { 
          header("Location: login.php"); 

      }; 
};

Before using session_start(), setcookie(), header() On screen should not output anything — Winston, Feb 25 '13 at 20:04

score 0 · Answer 1 · answered Feb 25 '13 at 20:06

0

Try insert session_start(); into PASSWORDS.PHP and delete it in other files. I think that than it work.

answered Feb 25 '13 at 20:06

mrakodol

1,143
3
12
41

Didn't work, same problem except now it's caused by passwords.php file – kamil234 Feb 25 '13 at 20:11

score 0 · Answer 2 · answered Feb 25 '13 at 20:10

0

You cannot output anything to the user before the start of the session. Your update.php file also does not echo the form to the user.

answered Feb 25 '13 at 20:10

chaoskreator

889
1
17
39

I don't understand, I'm not outputting anything before starting the session, it's the very first line on top of each page? – kamil234 Feb 25 '13 at 20:12
Make sure you don't have any whitespace before the opening php tag and it might be wise to ensure that everything is UTF8 encoded. – chaoskreator Feb 25 '13 at 20:19
I got it to work. I cannot upvote but thank you. I had to delete all whitepace in the file so the very first character on the screen was – kamil234 Feb 25 '13 at 20:20
Glad you got it sorted. :) – chaoskreator Feb 25 '13 at 20:24

PHP cookies & sessions

2 Answers2