笨。 如何检查嵌套数组中的重复项并在存在重复项时更新它？

Question

How to check if nested array contains duplicates? if it does contain duplicate then how to update it?

Example

Array
(

[0] => Array
    (
        [pre_order_id] => 10
        [product_id] => 1
        [product_quantity] => 11
        [product_unit_id] => 2
        [storage_location_id] => 1
        [price] => 1111
    )

    [1] => Array
        (
            [pre_order_id] => 10
            [product_id] => 1
            [product_quantity] => 11
            [product_unit_id] => 2
            [storage_location_id] => 1
            [price] => 1111
        )

    [2] => Array
        (
            [pre_order_id] => 10
            [product_id] => 3
            [product_quantity] => 11
            [product_unit_id] => 2
            [storage_location_id] => 1
            [price] => 1111
        )
)

Here product_id is duplicated on two occasions .i want to keep only one and also update the quantity of it by adding the product_quantity of the other array which will be discarded.

I have tried this

  // $input = array_map("unserialize", array_unique(array_map("serialize", $data_array)));

But it only removes duplicates not update .

Answer 1

After removing duplicates.You have to use $this->db->update_batch() for updating multidimensional array. Like this..

$this->db->update_batch('table_name',$input,$product_id);

For more see Codeigniter Query Builder

Answer 2

If you want to do this in pure PHP you can use something like this:

function cleanDuplicates($aInput) {
    $outPutArray = array();
    foreach($aInput as $element) {
        if(!isset($outPutArray[$element["product_id"]])) {
            $outPutArray[$element["product_id"]] = $element;
        }
        else {
            $outPutArray[$element["product_id"]]["product_quantity"] += $element["product_quantity"];
        }
    }

    return $outPutArray;
}