How to unset/destroy all session data except some specific keys?

Question

I have some session data in a website. I want to destroy all session data when user click another page, except some specific keys like $_SESSION['x'] and $_SESSION['y'].

Is there a way to do this?

Do I understand you correctly? You want to keep $_SESSION['x'] and $_SESSION['y']? — ty812, Aug 27 '11 at 11:58

score 25 · Accepted Answer · answered Aug 27 '11 at 12:00

25

Maybe do something like this

foreach($_SESSION as $key => $val)
{

    if ($key !== 'somekey')
    {

      unset($_SESSION[$key]);

    }

}

answered Aug 27 '11 at 12:00

Kemal Fadillah

9,760
3
45
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score 5 · Answer 2 · edited Jun 10 '14 at 10:24

5

to unset a particular session variable use.

unset($_SESSION['one']);

to destroy all session variables at one use.

session_destroy()

To free all session variables use.

session_unset();

if you want to destroy all Session variable except x and y you can do something like this.

$requiredSessionVar = array('x','y');
foreach($_SESSION as $key => $value) {
    if(!in_array($key, $requiredSessionVar)) {
        unset($_SESSION[$key]);
    }
}

edited Jun 10 '14 at 10:24

Community

1
1

answered Aug 27 '11 at 11:56

Ibrahim Azhar Armar

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@Benjamin: you can iterate over the variables in a session. – ZeissS Aug 27 '11 at 11:59

score 3 · Answer 3 · edited May 26 '14 at 11:54

3

As $_SESSION is a regular array, you can use array_intersect_key to get your resulting array:

$keys = array('x', 'y');
$_SESSION = array_intersect_key($_SESSION, array_flip($keys));

Here array_flip is used to flip the key/value association of $keys and array_intersect_key is used to get the intersection of both arrays while using the keys for comparison.

edited May 26 '14 at 11:54

Kemal Fadillah

9,760
3
45
63

answered Aug 27 '11 at 12:04

Gumbo

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844

Thanks @Gumbo, This helps too. But the easiest one is above for rookies. Thx again. – Benjamin Aug 27 '11 at 12:11

score 2 · Answer 4 · answered Aug 27 '11 at 12:01

2

Will this help?

function unsetExcept($keys) {
  foreach ($_SESSION as $key => $value)
    if (!in_array($key, $keys))
      unset($_SESSION[$key]);
}

answered Aug 27 '11 at 12:01

Vladimir

818
5
13

Yes it is. But i was searching a spesific function in Session Functions. Thanks, i will do this way. Also thanks @Kemal Fadillah for original loop. – Benjamin Aug 27 '11 at 12:04

score -2 · Answer 5 · answered Apr 24 '14 at 12:24

So when i can't ask i will answer:

This question is old but still someone is reviewing this like me i searched and i liked one of the answers but here is a better one: Lets unset $array1 except some variables as $array2

function unsetExcept($array1,$array2) {
    foreach ($array1 as $key => $value)
        if(!in_array($key, $array2)){
            unset($array1[$key]);
        }
    }
}

Why is this better ? IT'S NOT ONLY FOR $_SESSION

How to unset/destroy all session data except some specific keys?

5 Answers5

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