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
– str, Commented Oct 27, 2013 at 9:04

mamdouh alramadan · Accepted Answer · 2013-10-27 09:37:01Z

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, 2013 at 9:37

answered Oct 27, 2013 at 9:10

mamdouh alramadan

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3 Comments

Lix Over a year ago

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?

mamdouh alramadan Over a year ago

@Lix - adding a function such as array_pick to someone's library would be a good fix right?!

mamdouh alramadan Over a year ago

@Lix - that's why I attached a fiddle ;)

geomagas · Accepted Answer · 2013-10-27 09:55:13Z

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, 2013 at 9:55

answered Oct 27, 2013 at 9:24

geomagas

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3 Comments

h2ooooooo Over a year ago

Shouldn't "// remove keys 0 and 1" be "// remove anything but keys 0 and 1"?

geomagas Over a year ago

@h2ooooooo: You're right, it's just a typo in the fiddle... sorry! Works, nevertheless.

geomagas Over a year ago

@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!

Lix · Accepted Answer · 2013-10-27 09:04:45Z

0

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
);

answered Oct 27, 2013 at 9:04

Lix

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Comments

Shankar Narayana Damodaran · Accepted Answer · 2013-10-27 09:13:16Z

0

You can even use array_splice()

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

answered Oct 27, 2013 at 9:13

Shankar Narayana Damodaran

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1 Comment

Lix Over a year ago

Again, a nice idea... but what if the indexes are not sequential? $_SESSION["A"][4] and $_SESSION["A"][2]?

Ankit Agrawal · Accepted Answer · 2013-10-27 09:09:53Z

-3

try this

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

answered Oct 27, 2013 at 9:09

Ankit Agrawal

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1 Comment

Lix Over a year ago

Yea - but what does it do? It destroys the entire array. This is not what the question was asking for at all...

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