php - 配列内の任意の要素 (値) を配列であるキーに

Question

したがって、次のような配列があります。

$grades =
Array(

    [0] => Array ( [Grade] => Array ( [id] => 0 [name] => Kindegarten ) ) 
    [1] => Array ( [Grade] => Array ( [id] => 1 [name] => First ) ) 
    [2] => Array ( [Grade] => Array ( [id] => 2 [name] => Second ) ) 
    [3] => Array ( [Grade] => Array ( [id] => 3 [name] => Third ) ) 
    [4] => Array ( [Grade] => Array ( [id] => 4 [name] => Fourth ) ) 
    [5] => Array ( [Grade] => Array ( [id] => 5 [name] => Fifth ) ) 

    )//End array 

キー（最初の0〜5）を任意に選択する方法はありますか？CakePHP はこのようにテーブルの項目を返しますが、オプションを使用してフォーム ヘルパーの印刷にどのように適合させることができるかわかりません。

echo $this->Form->input('grade_selection', 
        array('type' => 'radio', 'options' => array($grades[?]['Grade']['id'] => $grades[?]['Grade']['name'])));

? 配列内の各項目を取得できるように、オプションで変更する方法はありますか?

class GradesController extends AppController {
    public function index(){
        //Gets all the rows in the grade table and stores it into a variable called grade. 
        //$grades = $this->Grade->find('all'); 
        $grades = $this->Grade->getGrades();

        //Returns the $grades variable when it is requested. 
        if($this->request->is('requested')){
            return $grades;
        }

        //Sends the $grades variable to the view file. The string 'grades' is the name of the variable that the Grades View file will have the same setup as the $grades.
        $this->set('grades', $grades);
    }
}