How to update a single value in a Laravel Session Array?

Question

I have a Session array like this:

[
    {
        "itemId": "1",
        "itemQuantity": "3",
        "itemName": "Item_name1"
    },
    {
        "itemId": "2",
        "itemQuantity": "2",
        "itemName": "Item_name2"
    }
]

How can I update the quantity of a single item if I know the itemId?

I know that one way of doing this would be to fetch the whole array, loop through the array, make the updates and 'put' the entire array back into the session. Is this the only way?

I'm a beginner. Please help out. Thanks.

In case you're using the array session driver, that I'm afraid that's the only option. — Ofir Baruch
– Ofir Baruch, Commented May 10, 2015 at 12:13
Hey there. Out of curiosity, is your itemId auto-incrementing? If it is, how did you achieve it? — theGreenCabbage
– theGreenCabbage, Commented Aug 6, 2015 at 2:48

peterm · Accepted Answer · 2015-05-11 01:30:13Z

2

Objects are passed by reference so you can simply do this.

foreach(Session::get('cart') as $item) {
    if ($item->itemId == '2') { // say we  want to double the quantity for itemId 2
        $item->itemQuantity = $item->itemQuantity * 2;
        break;
    }
}
dd(Session::get('cart'));

Output:

array:2 [▼
  0 => {#162 ▼
    +"itemId": "1"
    +"itemQuantity": "3"
    +"itemName": "Item_name1"
  }
  1 => {#163 ▼
    +"itemId": "2"
    +"itemQuantity": 4  <<--- the quantity has been doubled
    +"itemName": "Item_name2"
  }
]

edited May 11, 2015 at 1:30

answered May 10, 2015 at 19:07

peterm

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5 Comments

SoHo Over a year ago

@peterm I'm trying something similar but I'm getting "Trying to get property of non-object" error on line ` $item->itemQuantity = $item->itemQuantity * 2; `

SoHo Over a year ago

@peterm yes, I'm just not sure why it happens since my code is based on yours:

foreach(Session::get('cart.program') as $item){     if ($item->id == '1xxx') {         $item->segment_weekday = '9';         break;     } }

SoHo Over a year ago

@peterm var_dump(Session::get('cart.program')):

array (size=2)   0 =>      array (size=1)       'id' => string '1' (length=1)   1 =>      array (size=1)       'id' => string '1xxx' (length=4)

SoHo Over a year ago

@peterm Thanks for your help. I can access array members, just can't figure out how to pass $item by reference &$item to save back to session.

SoHo Over a year ago

@peterm Created a new question at stackoverflow.com/questions/31887608/…

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