Write SESSION via function

Question

I am having problem with adding items in $_SESSION variable of PHP with a custom function. so... I want to write sessions with a function like this

public function set($key, $value) {
    $_SESSION[$key] = $value;
}

but every time when I call the function the array is overwritten

//$combination = "1-10"; > 1 = product_id | 10 = option_id

$this->session->set("cart", array(implode("-", $combination) => array(
    "product_id" => $combination["product_id"],
    "variant_id" => $combination["variant_id"],
    "quantity" => 1
)));

OUTPUT

[cart] => Array
    (
        [1-30] => Array
            (
                [product_id] => 1
                [variant_id] => 30
                [quantity] => 1
            )
    )
)

This is working properly

$_SESSION["cart"][implode("-", $combination)] = array(
    "product_id" => $combination["product_id"],
    "variant_id" => $combination["variant_id"],
    "quantity" => 1
);

OUTPUT

[cart] => Array
(
    [1-30] => Array
        (
            [product_id] => 1
            [variant_id] => 30
            [quantity] => 1
        )
    [1-29] => Array
        (
            [product_id] => 1
            [variant_id] => 29
            [quantity] => 1
        )
    [1-28] => Array
        (
            [product_id] => 1
            [variant_id] => 28
            [quantity] => 1
        )
)

$_SESSION["cart"][implode("-", $combination)] only adds a single array to session[cart]. How do you end up with 3 entries? — apokryfos
– apokryfos, Commented Mar 13, 2017 at 14:27

Theo · Accepted Answer · 2017-03-13 21:15:38Z

1

You are calling set, which you have written to overwrite the entire array value.

You would either need to get it first, add your value and then set:

$cart  = $this->session->get("cart");
$cart[implode("-", $combination)] = array(
    "product_id" => $combination["product_id"],
    "variant_id" => $combination["variant_id"],
    "quantity" => 1
);
$this->session->set("cart", $cart);

or add a new method to handle a 2 dimensional array:

public function merge($key,$value){
    $_SESSION[$key]=array_merge($_SESSION[$key],$value);
}

$this->session->merge("cart", array(implode("-", $combination) => array(
    "product_id" => $combination["product_id"],
    "variant_id" => $combination["variant_id"],
    "quantity" => 1
)));

or

public function setInArray($key, $subKey, $value){
    $_SESSION[$key][$subKey]=$value;
}

$this->session->setInArray("cart", implode("-", $combination), array(
    "product_id" => $combination["product_id"],
    "variant_id" => $combination["variant_id"],
    "quantity" => 1
));

edited Mar 13, 2017 at 21:15

answered Mar 13, 2017 at 21:10

Theo

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1 Comment

Alex Over a year ago

Thank you sir! That's what I wanted. Thank you!

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