How to merge these three arrays into one array? Please give me some ideas or code. Thank you.

How to add values ​​in multiple arrays?

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How to add values ​​in multiple arrays?

You can use array_reduce(array, processing function, initial value)

array_reduce — Iteratively reduce an array to a single value using a callback function

<code class="php"><?php

$arr = [
    [
        [ 'count' => 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 '<pre class="brush:php;toolbar:false">';
print_r($sum);
echo '

';