如何通過模型的一個屬性對Yii2模型結果集進行分組？

Question

在我的'學生'表中，有字段'id'，'student_name'，'father_name'和'class'，這樣的

var_dump(Students::find()->All());

給出以下結果

array (size=284)
  0 => 
    object(frontend\models\Students)[68]
      private '_attributes' (yii\db\BaseActiveRecord) => 
        array (size=10)
          'id' => int 1
          'student_name' => string 'VATS' (length=5)
          'father_name' => string 'KARAMJEET SINGH' (length=15)
          'class' => string '1st' (length=3)

    1 => 
    object(frontend\models\Students)[68]
      private '_attributes' (yii\db\BaseActiveRecord) => 
        array (size=10)
          'id' => int 2
          'student_name' => string 'VASHISHT' (length=5)
          'father_name' => string 'PARAM KUMAR' (length=15)
          'class' => string '1st' (length=3)     

        ......................
        ......................
        ......................

我想使用模型的'class'字段作為索引，如下所示...例如

1st => 
    0=> 'id' => int 1
          'student_name' => string 'VATS' (length=5)
          'father_name' => string 'KARAMJEET SINGH' (length=15)
          'class' => string '1st' (length=3)  
    1=>  array (size=10)
          'id' => int 2
          'student_name' => string 'VASHISHT' (length=5)
          'father_name' => string 'PARAM KUMAR' (length=15)
          'class' => string '1st' (length=3)     

          ......................
          ......................

我已經嘗試過Arrayhelper::map($array,... , .. )函數，還有Arrayhelper::index(..)函數。 Arrayhelper::index($array, 'field_name_to_be_used_as_index')似乎可以完成這項任務，但它只為每個'class'類型提供一個結果。 如何以上述格式實現數組？

Answer 1

實現這一目標的唯一方法是循環並創建一個新數組

$original_array = Students::find()->asArray()->All();
$grouped_array = [];
foreach ($original_array as $value) {
    $grouped_array[$value['class']][] = $value;
}
var_dump($grouped_array);