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Languages :: PHP :: Link and session
By: mbarka U.S.A.  Date: 19/06/2003 00:00:00  English  Points: 300 Status: Answered
Quality : Excellent
I have a code like this
<?php
session_start();
global $Login,$Logout;
session_register("Login");
session_register("Logout");
......some code

if ($HTTP_SESSION_VARS[login] == "1") {
echo "You are inlogged
";
echo 'Klick<a href="side2.php?logout=1">here</a>';
}
?>

/////Side2.php

<?php
session_start();
if ($HTTP_SESSION_VARS[logout] == "1"){
session_unset();
session_destroy();
echo 'Du är utloggad' ;
?>

the problem is i get a white side with the right adress

<A HREF="http://webbfk.tk.ah.com/~txxeu0bb/side2.php?logout=1">http://webbfk.tk.ah.com/~txxeu0bb/side2.php?logout=1</a>

my question how to use $HTTP_SESSION_VARS when using <a href
By: Wubbie Date: 19/06/2003 08:01:00 English  Type : Answer
I think you need to put quotes around your session variables -- as it is, they're not actually being looked up.

So instead of $HTTP_SESSION_VARS[logout] use $HTTP_SESSION_VARS['logout']

Also, if you have a newer version of PHP (4.0+ maybe?) try using $_SESSION['logout'] instead.

Post again if this does not solve your problem.
By: sumotimor Date: 19/06/2003 08:06:00 English  Type : Assist
Looks like you've got case-sensitive issues with your variable names. $logout != $Logout. Change all occurences of "Logout" to "logout" and I think it will work.

By default, PHP uses cookies to store the sessionID for the client, so you don't have to worry about propagating the sessID in your <a> links.
By: mbarka Date: 19/06/2003 08:30:00 English  Type : Comment
When i use the code like this
if ($HTTP_SESSION_VARS[Login] == "1") {
echo "You are inlogged
";
$Logout=1;
echo 'Klick<a href="side2.php">here</a>';
}
?>

this code works
<?php
session_start();
if ($HTTP_SESSION_VARS[Logout] == "1"){
session_unset();
session_destroy();
echo 'Du är utloggad' ;
?>

but i doesnt work like this
if ($HTTP_SESSION_VARS[Login] == "1") {
echo "You are inlogged
";
//$Logout=1;
echo 'Klick<a href="side2.php?Logout=1">here</a>';
}
?>
By: Wubbie Date: 19/06/2003 08:32:00 English  Type : Assist
sumotimor is correct. :)

One more thing to remember is that == does not do type comparison, this usually still works but CAN still get you in trouble. You need to use === for type and value comparison.
By: Wubbie Date: 19/06/2003 08:33:00 English  Type : Assist
You do need the session_start() in there to reinitialize your session.
By: VGR Date: 20/06/2003 05:40:00 English  Type : Assist
sumotimor is 100% right

here's a fixed code :

<?php
session_start();
global $Login,$Logout; // useless, even without register_globals=On in php.ini
// personally, I affect values BEFORE session_registering ; it works better
session_register("Login"); // so you use "old-style" registration : you thus can't use afterwards $_SESSION['Login']
session_register("Logout");
......some code

if ($Login == "1") { // you CAN NOT MIX styles to access session variables !
echo "You are inlogged
"; // indent code
echo 'Klick <a href="side2.php?logout=1">here</a>'; // double quotes are useless if no space possible inside the link
} // if login=1
?>

/////Side2.php

<?php
session_start();
if (isset($_GET['logout'])) $Logout=$_GET['logout']; // beware of the case
// else $Logout remains it's session value (register_globals=On)
if ($Logout == "1"){
session_unset();
session_destroy();
echo 'Du är utloggad' ;
} else echo "no logout provided";
?>

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