PHP - Session array - prevent duplicate entrys

Question

This one is really bugging me, and can not find a easy solution.

On a detail view of a product, i set the info to a session, maximum 4:

$_SESSION['recent'][] = array(
      'id' => $productimgfolder,
      'title' => $product['Product']['title'],
      'link' => $_SERVER['REQUEST_URI'],
      'image' => 'img/products/'.$productimgfolder.'/'.$product['Product']['mainpicture']
    );
$_SESSION['recent'] = array_slice($_SESSION['recent'],-4);

This part works, if i output the session: edit image => this is wat happens if i reload the detail view

enter image description here

The part i'am struggling with is, when i reload a detail view, the info in the session is duplicated.

How can i prevent this from happening?

I tried it with in_array & array_unique, i'am doing something wrong

Can't you specify a key for the array you're adding to $_SESSION['recent']? It is going to help you prevent duplicates — STT LCU
– STT LCU, Commented Apr 27, 2015 at 7:01
Please share the duplicated data or the keys that you find on reload — Ashwani Goyal
– Ashwani Goyal, Commented Apr 27, 2015 at 7:03
Please provide what you hope your session to look like after a refresh. — Eugene C
– Eugene C, Commented Apr 27, 2015 at 7:03
What if you have "A B C D" and then load "C" ... should it show "B C D C" or "A B C D"? — Ja͢ck
– Ja͢ck, Commented Apr 27, 2015 at 7:18

Ali Arshad · Accepted Answer · 2015-04-27 07:17:06Z

5

The easy solution:

if the id is unique, you can do like this:

if(!array_key_exists ($productimgfolder, $_SESSION['recent']))
{
    $_SESSION['recent'][$productimgfolder] = array(
          'id' => $productimgfolder,
          'title' => $product['Product']['title'],
          'link' => $_SERVER['REQUEST_URI'],
          'image' => 'img/products/'.$productimgfolder.'/'.$product['Product']['mainpicture']
        );
}

$_SESSION['recent']=array_slice($arr, -4, 4, true);

other wise you have to foreach the recent array and check for id in the loop...

edited Apr 27, 2015 at 7:17

answered Apr 27, 2015 at 7:04

Ali Arshad

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5 Comments

Kristiyan Over a year ago

You can't use custom key, because array_slice will overwrite them. Try it.

DQM Over a year ago

Why did someone rate down this answer? It's the proper way. @Kristiyan, last param of array_slice is the flag to preserve key

Ali Arshad Over a year ago

@Kristiyan I have updated the answer, this is how you can use array_slice

Mark Over a year ago

thx Ali, this solution works, its preventing duplacte entries.i learned from you.

Kristiyan Over a year ago

Yes, my mistake. I just tried your code and it's doesn't work. Now it's ok.

glend · Accepted Answer · 2015-04-27 07:11:44Z

0

A different solution may be;

array_unshift($sessionArray, $singleArrayElement);
if (count($sessionArray) > 4) {
    array_pop($seassionArray);
};

answered Apr 27, 2015 at 7:11

glend

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Comments

shadab · Accepted Answer · 2015-04-27 07:18:53Z

0

You need to check isset

if(!isset($_SESSION['recent']))
{
        $_SESSION['recent'] = array()
 }

THEN YOU CAN CHECK IF SESSION IS EMPTY

if(empty($_SESSION['recent']))
 {
    //here you add your data
 }

because you are using array push, on page reload it adds data unless you check if session is empty. if yes you add data to your session.

edited Apr 27, 2015 at 7:18

answered Apr 27, 2015 at 7:04

shadab

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1 Comment

Mark Over a year ago

its not about that the session exists, its about to prevent duplicate entries in the session.

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