Question

Here is the array:

 [cart] => Array
        (
            [ProductId] => Array
                (
                    [0] => P121100001
                    [1] => P121100002
                )

            [SellerId] => Array
                (
                    [0] => S12110001
                    [1] => S12110001
                )

            [SpecifyId] => Array
                (
                    [0] => 1
                    [1] => 2
                )

            [Quantity] => Array
                (
                    [0] => 1
                    [1] => 1
                )

            [Price] => Array
                (
                    [0] => 12
                    [1] => 29
                )

            [TotalPrice] => 41
        )

I have the ProductId and I want to remove all the other items matching P121100002’s key.

Is there an easy way to do this I can’t can seem to come up with one?

Answer 1

You can loop through the full array and use unset() to, well, “unset” the specified index:

$index = array_search($cart['ProductId'], 'P121100002');
if ($index !== false) {
    foreach ($cart as $key => $arr) {
        unset($cart[$key][$index]);
    }
}

The slight caveat to this approach is that it may disrupt your index orders. For instance, say you have:

[ProductId] => Array (
    [0] => P121100001
    [1] => P121100002
    [2] => P121100003
)

And you want to remove P121100002, which has a corresponding index of 1. Using unset($cart['ProductId'][1]) will cause your array’s to become:

[ProductId] => Array (
    [0] => P121100001
    [2] => P121100003
)

This may be something to remain concerned with if you’re going to use a for loop to iterate through in the future. If it is, you can use array_values() to “reset” the indexes in the unset() loop from above:

foreach ($cart as $key => $arr) {
    unset($cart[$key][$index]);
    $cart[$key] = array_values($cart[$key]);
}