PHP array multi-dimensional sorting practice: from simple to complex scenarios

Multidimensional array sorting can be divided into single column sorting and nested sorting. Single column sorting can use the array_multisort() function to sort by columns; nested sorting requires a recursive function to traverse the array and sort. Practical cases include sorting by product name and compound sorting by sales volume and price.

PHP array multi-dimensional sorting practice: from simple to complex scenarios

Introduction

In PHP, sorting multidimensional arrays is usually a complex task. This tutorial will guide you step-by-step through how to sort multi-dimensional arrays based on different scenarios, from simple single-column sorting to complex nested sorting.

Single column sort

The simplest multidimensional array sort is to sort based on a single column. You can use array_multisort() Function:

$arr = [
    ['id' => 1, 'name' => 'John Doe'],
    ['id' => 3, 'name' => 'Jane Smith'],
    ['id' => 2, 'name' => 'Bob Johnson'],
];

array_multisort(array_column($arr, 'id'), SORT_ASC, $arr);

print_r($arr);
// 输出：
// Array
// (
//     [0] => Array
//         (
//             [id] => 1
//             [name] => John Doe
//         )
//     [1] => Array
//         (
//             [id] => 2
//             [name] => Bob Johnson
//         )
//     [2] => Array
//         (
//             [id] => 3
//             [name] => Jane Smith
//         )
// )

Nested array sort

For nested arrays, you need to use a recursive function to traverse the array And sort them:

function sortNestedArray($arr, $col, $order) {
    if (!is_array($arr)) {
        return $arr;
    }

    uasort($arr, function($a, $b) use ($col, $order) {
        if ($a[$col] == $b[$col]) {
            return 0;
        }

        return ($a[$col] < $b[$col]) ? -1 : 1;
    });

    foreach ($arr as &$item) {
        if (is_array($item)) {
            $item = sortNestedArray($item, $col, $order);
        }
    }

    return $arr;
}

Practical case

Case 1: Sort nested array by product name

$products = [
    ['id' => 1, 'name' => 'Apple', 'price' => 10],
    ['id' => 2, 'name' => 'Orange', 'price' => 15],
    ['id' => 3, 'name' => 'Banana', 'price' => 5],
];

$sortedProducts = sortNestedArray($products, 'name', SORT_ASC);

// ... 处理排序后的数组 ...

Case 2: Compound sorting of nested arrays by sales volume and price

$salesData = [
    ['product' => 'Apple', 'count' => 10, 'price' => 10],
    ['product' => 'Orange', 'count' => 15, 'price' => 15],
    ['product' => 'Banana', 'count' => 5, 'price' => 5],
];

usort($salesData, function($a, $b) {
    if ($a['count'] == $b['count']) {
        return ($a['price'] < $b['price']) ? -1 : 1;
    }

    return ($a['count'] < $b['count']) ? 1 : -1;
});

// ... 处理排序后的数据 ...

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