需要合并数组与匹配值[关闭]

Question

I have a array like this how i will get new array

Array
(
    [0] => Array
        (
            [model] => MX555
            [color] => RED
            [qty] => 2
        )

    [1] => Array
        (
            [model] => MX555
            [color] => RED
            [qty] => 2
        )

    [2] => Array
        (
            [model] => MX555
            [color] => Green
            [qty] => 2
        )

    [3] => Array
        (
            [model] => MX555
            [color] => Green
            [qty] => 1
        )
)

I need to return the array like this

Array
(
    [0] => Array
        (
            [model] => MX555
            [color] => RED
            [qty] => 4
        )



    [1] => Array
        (
            [model] => MX555
            [color] => Green
            [qty] => 4
        )
)

Answer 1

I'm assuming you want to identify duplicate items by multiple values, in this case both model and color (if you only want to group by the single value color then see RamC's answer instead). One approach is to create an array, where each key is created by concatenating those values:

function mergeQuantitiesByModelAndColor(array $array)
{
    $merged_array = array();
    foreach ($array as $item) {
        $key = $item['model'] . '|' . $item['color'];
        if (!isset($merged_array[$key])) {
            $merged_array[$key] = $item;
        } else {
            $merged_array[$key]['qty'] += $item['qty'];
        }
    }
    return array_values($merged_array);
}

When tested as follows (php 5.6):

$array = array(
    array(
        'model' => 'MX555',
        'color' => 'RED',
        'qty' => 2,
    ),
    array(
        'model' => 'MX555',
        'color' => 'RED',
        'qty' => 2,
    ),
    array(
        'model' => 'MX555',
        'color' => 'Green',
        'qty' => 2,
    ),
    array(
        'model' => 'MX555',
        'color' => 'Green',
        'qty' => 1,
    ),
);

var_dump(mergeQuantitiesByModelAndColor($array));

Gives output:

array(2) {
  [0]=>
  array(3) {
    ["model"]=>
    string(5) "MX555"
    ["color"]=>
    string(3) "RED"
    ["qty"]=>
    int(4)
  }
  [1]=>
  array(3) {
    ["model"]=>
    string(5) "MX555"
    ["color"]=>
    string(5) "Green"
    ["qty"]=>
    int(3)
  }
}