Array Keys and how do I get them?

[Temor]

I have this array setup:
[syntax=text] Array
(
[cart] => Array
(
[0] => Array
(
[item_id] => 1
[item_name] => item name
[price] => 2
[quantity] => 5
)

[1] => Array
(
[item_id] => 3
[item_name] => another item name
[price] => 1
[quantity] => 76
)

[2] => Array
(
[item_id] => 5
[item_name] => yet another item name
[price] => 3
[quantity] => 9
)

)

)[/syntax]

The cart array contains an array for every item inside the cart. What I want is the array key for each item. This is where I'm stuck.

This is probably just me being slow after not writing any code for at least a month, but any guidance is appreciated

[EcazS]

http://php.net/manual/en/function.array-keys.php

Maybe?
Not sure if that function works in "multiple dimensions" though, hmm..

[Temor]

array_keys will return the value of item_id. I want it to go up one level.

[EcazS]

So, if I understand this correctly you want (from your example) 0, 1 and 2?

[Temor]

yes. precisely

[EcazS]

Well, I suppose if the array will always be called "cart" you could do something like this.
Hopefully I replicated your array correctly,
[syntax=php]
$array = array(
"cart" => array(
"0" => array(
"item_id" => "1",
"item_name" => "item name",
"price" => "2",
"quantity" => "5"
),
"1" => array(
"item_id" => "3",
"item_name" => "another item name",
"price" => "1",
"quantity" => "76"
),
"2" => array(
"item_id" => "5",
"item_name" => "yet another item name",
"price" => "3",
"quantity" => "9"
)
)
);

echo "<pre>" . print_r(array_keys($array["cart"]), true) . "</pre>";
[/syntax]
This returns an array that looks like this,
[syntax=text]
Array
(
[0] => 0
[1] => 1
[2] => 2
)
[/syntax]

[Temor]

Works wonders. Thank you