php实现组合排序 代码实现

PHP实现组合排序代码示例

组合排序通常指对多维数组或多条件进行排序。以下是几种常见实现方式：

使用array_multisort函数

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

// 提取排序字段
$ages = array_column($data, 'age');
$scores = array_column($data, 'score');

// 先按age升序，再按score降序
array_multisort($ages, SORT_ASC, $scores, SORT_DESC, $data);

print_r($data);

使用usort自定义排序

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

usort($data, function($a, $b) {
    if ($a['age'] == $b['age']) {
        return $b['score'] - $a['score']; // score降序
    }
    return $a['age'] - $b['age']; // age升序
});

print_r($data);

对象集合排序

class User {
    public $name;
    public $age;
    public $score;

    public function __construct($name, $age, $score) {
        $this->name = $name;
        $this->age = $age;
        $this->score = $score;
    }
}

$users = [
    new User('John', 25, 80),
    new User('Alice', 30, 90),
    new User('Bob', 25, 85)
];

usort($users, function($a, $b) {
    return [$a->age, $b->score] <=> [$b->age, $a->score];
});

foreach ($users as $user) {
    echo "{$user->name}, {$user->age}, {$user->score}\n";
}

多字段动态排序

function multiSort(array &$array, array $sortCriteria) {
    usort($array, function($a, $b) use ($sortCriteria) {
        foreach ($sortCriteria as $field => $order) {
            if ($a[$field] != $b[$field]) {
                return ($order === SORT_ASC) 
                    ? $a[$field] <=> $b[$field] 
                    : $b[$field] <=> $a[$field];
            }
        }
        return 0;
    });
}

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

multiSort($data, ['age' => SORT_ASC, 'score' => SORT_DESC]);
print_r($data);

以上示例展示了PHP中实现组合排序的多种方法，可根据实际需求选择合适的方式。array_multisort适合简单场景，usort提供更灵活的定制，而最后的多字段动态排序函数则提供了可配置的解决方案。