使用laravel Groupby遍历集合

$collection->groupBy(function ($item, $key) {
    // 返回分组的条件，可以是$item的某个属性或者其他逻辑判断
});

$users = collect([
    ['name' => 'John', 'role' => 'admin'],
    ['name' => 'Jane', 'role' => 'user'],
    ['name' => 'Bob', 'role' => 'admin'],
    ['name' => 'Alice', 'role' => 'user'],
]);

$grouped = $users->groupBy(function ($item, $key) {
    return $item['role'];
});

// 输出结果
/*
Illuminate\Support\Collection Object
(
    [items:protected] => Array
        (
            [admin] => Illuminate\Support\Collection Object
                (
                    [items:protected] => Array
                        (
                            [0] => Array
                                (
                                    [name] => John
                                    [role] => admin
                                )

                            [1] => Array
                                (
                                    [name] => Bob
                                    [role] => admin
                                )

                        )

                )

            [user] => Illuminate\Support\Collection Object
                (
                    [items:protected] => Array
                        (
                            [0] => Array
                                (
                                    [name] => Jane
                                    [role] => user
                                )

                            [1] => Array
                                (
                                    [name] => Alice
                                    [role] => user
                                )

                        )

                )

        )

)
*/