PHP: unset $_SESSION of array

Question

I have a session of arrays named:

$_SESSION['A'];

it contains

$_SESSION['A'][0] = 'A';
$_SESSION['A'][1] = 'B';

I can unset the $_SESSION['A']; using

unset($_SESSION['A']);

it unset all the value in the array how can I unset all value stored in

$_SESSION['A'];

exept

$_SESSION['A'][0];
$_SESSION['A'][1];

I've seen this POST

which it unset all $_SESSION exept some stored in array. I used this code to unset it on array but I don't know how to used it as arrays.

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

Loop through it using a `for` loop and unset the values manually. — str, Oct 27 '13 at 09:04

mamdouh alramadan · Accepted Answer · 2013-10-27T09:37:01.027

2

use array_slice like this:

$_SESSION['A'] = array_slice($_SESSION['A'], 0, 2);

Update:

Also, for non sequential indexes we can create this function:

  function array_pick($picks, $array)
    {
     $temp = array();
        foreach($array as $key => $value)
        {
            if(in_array($key, $picks))
            {
                $temp[$key] = $value;
            }
        }
     return array_values($temp);// or just $temp to keep original indexes
    }

PHPFiddle

edited Oct 27 '13 at 09:37

answered Oct 27 '13 at 09:10

mamdouh alramadan

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1

Good idea! But you forgot to place the values back in the session variable. This solution also doesn't handle cases where the indexes are not sequential. How would you solve it for indexes 3 and 7? – Lix Oct 27 '13 at 09:12
1

@Lix - adding a function such as `array_pick` to someone's library would be a good fix right?! – mamdouh alramadan Oct 27 '13 at 09:31
@Lix - that's why I attached a fiddle ;) – mamdouh alramadan Oct 27 '13 at 09:33

geomagas · Answer 2 · 2013-10-27T09:55:13.510

2

How about:

$keys = array(0,1);
$_SESSION['A'] = array_intersect_key($_SESSION['A'], array_flip($keys));

And here's the proof of concept.

edited Oct 27 '13 at 09:55

answered Oct 27 '13 at 09:24

geomagas

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Shouldn't "*// remove keys 0 and 1*" be "*// remove anything but keys 0 and 1*"? – h2ooooooo Oct 27 '13 at 09:43
@h2ooooooo: You're right, it's just a typo in the fiddle... sorry! Works, nevertheless. – geomagas Oct 27 '13 at 09:46
@mamdouhalramadan: Nah, merely fixed the last piece of code from the OP's question... There are other things I'm a lot more proud of ;) Cheers! – geomagas Oct 27 '13 at 10:24

score 0 · Answer 3 · answered Oct 27 '13 at 09:04

You won't be able to do unset only certain values in an array. Rather, just save the values of those variables, unset the entire array and then reset the values.

// Save existing values
$saved_var1 = $_SESSION["A"][0];
$saved_var2 = $_SESSION["A"][1];

// Unset the entire array
unset( $_SESSION["A"] );

// Set the values by the saved variables
$_SESSION["A"] = array(
  $saved_var1,
  $saved_var2
);

score 0 · Answer 4 · answered Oct 27 '13 at 09:13

0

You can even use array_splice()

$_SESSION['A']=array_splice($_SESSION['A'], 2);

answered Oct 27 '13 at 09:13

Shankar Narayana Damodaran

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Again, a nice idea... but what if the indexes are not sequential? `$_SESSION["A"][4]` and `$_SESSION["A"][2]`? – Lix Oct 27 '13 at 09:14

score -3 · Answer 5 · answered Oct 27 '13 at 09:09

-3

try this

$_SESSION['A'] = array();
unset($_SESSION['A']);

answered Oct 27 '13 at 09:09

Ankit Agrawal

6,034
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49

Yea - but what does it do? It destroys the entire array. This is not what the question was asking for at all... – Lix Oct 27 '13 at 09:33

PHP: unset $_SESSION of array

5 Answers5