I Need to add items to array, not replace them - php

Question

I have a little script system. It replaces the array but I need it to add to the array. This is what I have:
$_SESSION['cart']=array(); // Declaring session array
array_push($_SESSION['cart'],'item1'); // Item added to cart
If after this I submit:
$_SESSION['cart']=array(); // Declaring session array
array_push($_SESSION['cart'],'item2'); // Item added to cart
It will contain item2 in array not item1 and item2.
How can I get it to do this?
So I changed up my code a bit and not when I push for example the code below twice it will overwrite the item. How can I make it add another one instead?
array_push($_SESSION['cart']['itemName'] = 13.99);

Answer 1

It seems that you are recreating the array on the second set of code meaning that you will delete everything already in the array. Did you try just array_push without the $_SESSION['cart']=array(); for the second set of code? If not try getting rid of that first line and see if it works.

Answer 2

Use this syntax to append:
$_SESSION['cart'][] = 'item1';
$_SESSION['cart'][] = 'item2';
Edit:
// declare only if needed
if (!array_key_exists('cart', $_SESSION)) $_SESSION['cart'] = array();
// when adding an item at any future time once $_SESSION['cart'] exists:
$_SESSION['cart'][] = array(
'itemName' => 'my item',
'price' => 13.99
);

Answer 3

By calling this line every time :
$_SESSION['cart']=array();
You are cleaning out your cart session. If you wrap that in an if statement as well to check whether the array has already been instantiated, then you won't clean it out each time and you should be able to add to it as expected:
if (!isset($_SESSION['cart'])) {
$_SESSION['cart']=array();
}

Answer 4

You are emptying your array before you add to it you declare $_SESSION['cart'] to equal a new empty array

Answer 5

U declared 2 times $_SESSION['cart']. Remove second declare and you should be good to go.
EDIT :
U don't use correct syntax for array_push.
PHP.net : array_push()
If i understood correctly - the index of key (numeric since array_push) bothers you.
U can bypass by using this code :
$_SESSION['cart'] = array();
$_SESSION['cart']['itemName'] = 12.50;
$_SESSION['cart'] = $_SESSION['cart'] + array("blabla" => 13.99);
print "<pre>";
print_r($_SESSION);
print "</pre>";
Result :
Array
(
[cart] => Array
(
[itemName] => 12.5
[blabla] => 13.99
)
)
LAST EDIT : (!?!)
function set_item_price($itemName, $itemPrice)
{
if(!isset($_SESSION['cart'][$itemName]['itemPrice']))
$_SESSION['cart'][$itemName]['itemPrice'] = $itemPrice;
else
echo "Item Already exists \n <br>";
}
function add_to_cart($itemName, $quantity)
{
if(!isset($_SESSION['cart'][$itemName]['quantity']))
$_SESSION['cart'][$itemName]['quantity'] = $quantity;
else
$_SESSION['cart'][$itemName]['quantity'] += $quantity;
}
// Adding item1 - price 12.50
set_item_price("item1", 12.50);
// Adding item1 - quantity - 2 & 3
// OutPut will be 5
add_to_cart("item1", 2);
add_to_cart("item1", 3);
// Adding item3 - price 15.70
set_item_price("item3", 15.70);
// Adding item1 - quantity - 5
add_to_cart("item3", 5);
print "<pre>";
print_r($_SESSION);
print "</pre>";
?>
RESULT :
Array
(
[cart] => Array
(
[item1] => Array
(
[itemPrice] => 12.5
[quantity] => 5
)
[item3] => Array
(
[itemPrice] => 15.7
[quantity] => 5
)
)
)
Otherwise check on this thread :
Stackoverflow : how-to-push-both-value-and-key-into-array-php