my problem is that the session variable did not get unset when running the below code. what is wrong?
<?php
session_start();
session_unset();
//session_destroy();
header("location: user_form.php");
?>
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4 Answers
You've not actually created a session you've started the session engine but not created a session variable. If you have a session variable $_SESSION['userid'] for example then you can just unset that value or expire it or set its value to something that would fail your if clause for your header redirect.
4 Comments
Ivo Pereira
If he is asking how to remove the $_SESSION variables, probably (I presume) that he already have them started from another page.
Dave
you would assume so but since he's not unsetting or destroying the specific variables created its no surprise its not unsetting them.
Ivo Pereira
Ahh, I've misunderstood what you mean, sorry :) That's why I've suggested something like a foreach to unset the vars.
Dave
Your method is greate if you want to unset all potential sessions but if he's looking to unset one specific session or is using sessions as a method of login security etc its not so good.
Usually I do something like:
<?php
session_start();
if(!empty($_SESSION) && is_array($_SESSION)) {
foreach($_SESSION as $sessionKey => $sessionValue)
session_unset($_SESSION[$sessionKey]);
}
session_destroy();
header("Location: user_form.php");
?>
1 Comment
Ivo Pereira
Edited, thanks @user1615903. Corrected the key in the array when unsetting.
Try this syntax (use a variable name in unset):
<?php
session_start();
if(isset($_SESSION['views']))
unset($_SESSION['views']);
?>
Comments
I'm guessing you already have variables within your session set, otherwise there would be nothing to "unset".
With session_unset the session itself would still exist, as it's just the equivalent of doing:
$_SESSION = array();
Unless of course you're using PHP 4.0.6 or below, then you would be expected to use:
unset ($_SESSION['varname']);
as per session_unset.
There isn't anything "wrong" with your code so to speak.
