How these three arrays are combined into an array, give a thought or code thank you

How do I add the values in multiple arrays?

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How do I add the values in multiple arrays?

can be usedarray_reduce(數組, 處理函數, 初始值)

array_reduce-iteratively to simplify the array to a single value with a callback function

  
    1 ]    ],    [        [ 'count' => 2 ],        [ 'count' => 67 ],    ]    ,    [        [ 'count' => 3 ],        [ 'count' => 2 ],    ],];$sum = array_reduce($arr, function($currentSumOuter, $itemOuter) {        // 這裡是各組中的 count 總和    // 返回結構是 [ 'count' => 總和 ]    $sumInner = array_reduce($itemOuter, function($currentSumInner, $itemInner) {        return [            'count' => $itemInner['count'] + $currentSumInner['count']        ];    }, 0);        // 這裡再按照原先結構，把各組總和再次總和    return [        [             'count' => $currentSumOuter[0]['count'] + $sumInner['count']        ]    ];}, 0);echo '
';print_r($sum);echo '
';

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