PHP array magic multidimensional sorting: a powerful tool for implementing complex sorting

The array magic multi-dimensional sorting technology in PHP uses the __callStatic() method to achieve complex multi-dimensional array sorting. 1. Create a sorting function array, containing the sorting function for each field. 2. Sort the array using a custom sort function. 3. Return the sorted array. Practical case: Sort a multi-dimensional array by age in ascending order and name in descending order, and output the sorted results.

PHP Array Magic Multidimensional Sorting: A powerful tool for implementing complex sorting

Introduction

In PHP, arrays are the basic structure for storing and organizing data. Sorting can be a complex task when dealing with multidimensional arrays. This tutorial will introduce a technique called Array Magic Multidimensional Sort, which provides a powerful method for complex sorting of multidimensional arrays.

Magic Methods

The array magic methods in PHP allow you to override the built-in sorting and comparison methods of arrays. To implement multidimensional sorting, we will use the __callStatic() method, which allows you to call a static method on a class even if the method does not exist.

In the following example, we create a Multisort class that overrides the array_multisort() method:

class Multisort {
    public static function __callStatic($method, $args) {
        // 检查方法名称是否是 "array_multisort"
        if ($method === "array_multisort") {
            // 创建一个排序函数数组
            $sortFns = [];

            // 遍历排序参数
            foreach ($args as $key => $field) {
                // 获取排序方式
                $direction = isset($args[$key + 1]) ? $args[$key + 1] : SORT_ASC;

                // 创建排序函数
                $sortFns[] = function($a, $b) use ($field, $direction) {
                    return strnatcmp($a[$field], $b[$field]) * $direction;
                };
            }

            // 使用自定义排序函数对数组进行排序
            usort($args[0], $sortFns);

            // 返回排序后的数组
            return $args[0];
        }
        throw new BadMethodCallException("Method $method does not exist.");
    }
}

Practical case

The following is a practical case for the Multisort class, which is used to sort multi-dimensional arrays containing multiple fields:

$data = [
    ['name' => 'John', 'age' => 30, 'score' => 85],
    ['name' => 'Alice', 'age' => 25, 'score' => 90],
    ['name' => 'Bob', 'age' => 35, 'score' => 80],
];

// 按年龄升序，然后按姓名降序排序
$sortedData = Multisort::array_multisort($data, 'age', SORT_ASC, 'name', SORT_DESC);

// 输出排序后的数据
print_r($sortedData);

This code will output The sorted data is as follows:

Array
(
    [0] => Array
        (
            [name] => Alice
            [age] => 25
            [score] => 90
        )

    [1] => Array
        (
            [name] => Bob
            [age] => 35
            [score] => 80
        )

    [2] => Array
        (
            [name] => John
            [age] => 30
            [score] => 85
        )

)

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