如何在 PHP Laravel Builder 查询中按键对数组进行分组

Question

我是新的 Laravel，我只想按键分组我的数组。这是我到目前为止所做的：

代码：

$vehicles = DB::select('call get_vehicles');
return $vehicles;

返回值：

[
   {
      "vhc_id":"001",
      "vhc_make":"Toyota",
      "vhc_model":"HiluxSR"
   },
   {
      "vhc_id":"001",
      "vhc_make":"Toyota",
      "vhc_model":"HiluxSR5"
   },
   {
      "vhc_id":"001",
      "vhc_make":"Toyota",
      "vhc_model":"Landcruiser"
   },
   {
      "vhc_id":"002",
      "vhc_make":"Ford",
      "vhc_model":"Ranger"
   },
   {
      "vhc_id":"002",
      "vhc_make":"Ford",
      "vhc_model":"Falcon"
   }
]

我只想要这样的东西：

[
   {
      "vhc_id":"001",
      "vhc_make":"Toyota",
      "vhc_model":[
         "HiluxSR",
         "HiluxSR5",
         "Landcruiser"
       ]
   },
   {
      "vhc_id":"002",
      "vhc_make":"Ranger",
      "vhc_model": [
         "Ranger",
         "Falcon"
       ]
   },
]

我尝试 foreach 到 $vehicles 变量，但它说 Cannot use object of type stdClass as array 有没有办法实现这一点？提前致谢。祝你有美好的一天~

Answer 1

考虑到您的代码，我会使用 Laravel Collections 来做类似的事情：

$vehicles = DB::select('call get_vehicles');

return collect($vehicles)
            ->groupBy('vhc_id')
            ->map(function ($group) {
                return [
                    'vhc_id' => $group[0]->vhc_id,
                    'vhc_make' => $group[0]->vhc_make,
                    'vhc_model' => $group->pluck('vhc_model')
                ];
            })
            ->values()
            ->all();

请注意，您得到的错误不是在 foreach 中迭代，而是因为您正在返回一个 stdClass 数组。

// (object) is used to cast the array to stdClass
$x = (object) ['a' => 1, 'b' => 2]; 

// you CAN'T do that
$x['a'];

// you SHOULD do that
$x->a;

回到你在 Laravel 中的问题，我建议你使用 dump 或 dd (dump and die) Laravel 的函数进行调试。

$vehicles = DB::select('call get_vehicles');

// dd to see your first vehicle as stdClass
dd($vehicles[0]);

// dd same thing as array
dd((array) $vehicles[0]);