In php, how to destroy the session variables - php

Question

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");
?>

Answer 1

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.

Answer 2

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");
?>

Answer 3

Try this syntax (use a variable name in unset):
<?php
session_start();
if(isset($_SESSION['views']))
unset($_SESSION['views']);
?>

Answer 4

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.