PHP parse array and count values in new array

Question

I have a PHP array that looks like this...

$array = [

    'item1' => [
        [
            'productCount' => '3',
            'value' => 'red',
        ],
        [
            'productCount' => '3',
            'value' => 'green',
        ],
        [
            'productCount' => '3',
            'value' => 'green',
        ]
    ],

    'item2' => [
        [
            'productCount' => '1',
            'value' => 'purple',
        ]
    ],

];

I am trying to parse it so it looks like this...

Array
(
    [item1] => Array
        (
            [productCount] => 3
            [red] => 1
            [green] => 2
        )
    [item1] => Array
        (
            [productCount] => 1
            [purple] => 1
        )
)

I have this so far....

$finalArray = array();

foreach ($array as $key => $arrayItem) {

    $finalArray[$key] = $arrayItem['productCount'];

    $valueCount = count($arrayItem['productCount']);

    $finalArray[$key] = $valueCount;

}

I know this isn't much but I am stuck at this point. How do I process the values and count them in the new array?

Answer 1

This code will give you the results you want. It loops over the upper level array to get the keys and productCount values for the new array. Then it loops over the second level arrays to get the counts of each value :

$output = array();
foreach ($array as $key => $items) {
    $output[$key] = array('productCount' => $items[0]['productCount']);
    foreach ($items as $item) {
        $value = $item['value'];
        $output[$key][$value] = ($output[$key][$value] ?? 0) + 1;
    }
}
print_r($output);

The inner loop can be written more concisely using array_column and array_count_values :

$output = array();
foreach ($array as $key => $items) {
    $output[$key] = array_merge(array('productCount' => $items[0]['productCount']),
                                array_count_values(array_column($items, 'value')));
}
print_r($output);

In both cases the output is:

Array
(
    [item1] => Array
        (
            [productCount] => 3
            [red] => 1
            [green] => 2
        )
    [item2] => Array
        (
            [productCount] => 1
            [purple] => 1
        )
)

Demo on 3v4l.org

Answer 2

For dynamic get all result use two times foreach loops

$array = [
    'item1' => [
        [
            'productCount' => '3',
            'value' => 'red',
        ],
        [
            'productCount' => '3',
            'value' => 'green',
        ],
        [
            'productCount' => '3',
            'value' => 'green',
        ]
    ],
    'item2' => [
        [
            'productCount' => '1',
            'value' => 'purple',
        ]
    ],
];
$new_array = $final_array = array();
foreach ($array as $key => $arrayItem) {
        foreach($arrayItem as $sub_key=>$second_item){
            $new_array[$key]['productCount'] = $second_item['productCount'];             
            $new_array[$key][$second_item['value']][] =$second_item['value'];           
        }
}
foreach ($new_array as $key => $value) {
        foreach($value as $sub_key =>$sub_value){
            $final_array[$key][$sub_key] = (is_array($sub_value))?count($sub_value):$sub_value;
        }
}
print_r($final_array);exit;

Output

Array
(
    [item1] => Array
        (
            [productCount] => 3
            [red] => 1
            [green] => 2
        )

    [item2] => Array
        (
            [productCount] => 1
            [purple] => 1
        )

)

Hope this is helpful to you.