PHP - Unset $_SESSION variables using foreach

Question

Is it possible to unset $_SESSION variables using a foreach cycle? This is an example.

<?php
session_start();
$_SESSION['one'] = 'one';
$_SESSION['two'] = 'two';
$_SESSION['three'] = 'three';
print_r($_SESSION);
foreach($_SESSION as $value) {
    unset($value);
}
session_destroy();
print_r($_SESSION);
?>

I think that this script should work but it's not working for me. It gives me this output, without unsetting the variables :

Array ( [one] => one [two] => two [three] => three )
Array ( [one] => one [two] => two [three] => three )

Maybe it's a problem related to superglobal arrays. I can anyway unset the variables using their key :

unset($_SESSION['one']);

Marwelln · Accepted Answer · 2017-04-16 12:16:53Z

2

You must get the key and unset $_SESSION[$key] or pass your variable by reference (not sure if you can unset a reference).

foreach($_SESSION as $key => $value) {
    unset($_SESSION[$key]);
}

foreach($_SESSION as &$value) {
    unset($value);
}

answered Apr 16, 2017 at 12:16

Marwelln

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1 Comment

DamiToma Over a year ago

The first solution is working, while the seconde one is not. Thanks!

Bara' ayyash · Accepted Answer · 2017-04-16 12:18:05Z

0

Pass the variable by reference :

foreach($_SESSION as &$value) {
    // edit $value
}

answered Apr 16, 2017 at 12:18

Bara' ayyash

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2 Comments

DamiToma Over a year ago

This solution is not working for me, but @Marwelln's one is.

Bara' ayyash Over a year ago

you can use session_unset to unset all the sessions

LF-DevJourney · Accepted Answer · 2017-04-16 12:20:34Z

0

unset it with,

unset($_SESSION);

answered Apr 16, 2017 at 12:20

LF-DevJourney

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1 Comment

TiberiumFusion Over a year ago

From php.net: Do NOT unset the whole $_SESSION with unset($_SESSION) as this will disable the registering of session variables through the $_SESSION superglobal.

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