Unset two-dimensional associative session array
Working with a two-dimensional associative array:
<?php
//array sessions are set as follows
$_SESSION['test']['car']['make']="ford";
$_SESSION['test']['car']['colour']="red";
$_SESSION['test']['bike']['make']="ducati";
$_SESSION['test']['bike']['colour']="yellow";
//and unset as follows
foreach($remove as $rem_key => $rem_value){
if (array_key_exists($rem_key, $_SESSION['test'])){
unset($_SESSION['test'][$rem_key]);
}
}
?>I have a form with checkboxes that allows removal of the items listed from the array. The form checkbox input name is remove[$session_key]
$remove is an array with keys that match the keys of the session for any selected (checked)
$remove values are all simply "delete" (not really needed although I do check before the foreach if = "delete")
The arrays set fine, printed all look ok and as expected. The above with both the car and bike:
Array ( [car] => Array ( [make] => ford [colour] => red ) [bike] => Array ( [make] => ducati [colour] => yellow ) )
I can put one array in the session and use the form to select to delete the item, and it works fine.
But when there are two or more items in the session, as with the above (car & bike) it seems to mess up the array.
Is this something to do with the indexes when one is removed within a foreach?
Or something else I'm missing?
Cheers
decibel.places posted this at 00:44 — 24th March 2009.
He has: 1,494 posts
Joined: Jun 2008
Are you using cookies (default handler) for the session vars?
Maybe inspecting the cookie at each step will provide a clue.
Isn't it actually a 3-dimensional array?
['test']['car']['make']So I would think your removal code may work if you add the additional level - because for one array, it is essentially two-dimensional, the first two keys are always the same, only the third one changes...
$_SESSION['test']['car']['make']="ford";$_SESSION['test']['car']['colour']="red";
greg posted this at 01:21 — 24th March 2009.
He has: 1,581 posts
Joined: Nov 2005
Maybe inspecting the cookie at each step will provide a clue.
$_SESSION['test']['car']['make']="ford";$_SESSION['test']['car']['colour']="red";
['test'] is the session name, albeit the session is an array, ['car'] is a key in the session array and the value for ['car'] is another array where ['make'] is one key and ford is the value, ['colour'] is another key and red is the value.
$rem_key would be "car" or "bike" and
unset($_SESSION['test'][$rem_key]);should remove that full array from the sessionShaggy posted this at 02:54 — 24th March 2009.
They have: 121 posts
Joined: Dec 2008
What is messed up about the array once you've done an unset on it?
Are you missing data? Is there too much data?
Cheers,
Shaggy.
decibel.places posted this at 03:17 — 24th March 2009.
He has: 1,494 posts
Joined: Jun 2008
I'm just getting vibes that having the same keys (make,colour) in two different arrays is somehow related to your problem...
Have you tested it out with all unique keys?
greg posted this at 11:29 — 24th March 2009.
He has: 1,581 posts
Joined: Nov 2005
Duplicate index refs (key names) in this instance are fine as they are different/separate arrays.
Otherwise PHP would hit an error creating them, not deleting them.
As you both mentioned, echoing out at every stage is the way to find errors, and I had done this (always do) I just didn't do it on another block of code that was also accessing the session.
)
(truth be known I thought I'd commented it out while testing this block
So as often is the case, it was that other piece of code that was causing the issue to the session, not the above delete loop.
And in the end was simply my numbtiness for not having commented out some untested code.
So all is well now, cheers.
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