CakePHP3で1Controller、1Templateのページを作る

CakePHP3で1Controller、1Templateのページを作る。
題材は画面から身長と体重を入力したらBMIを表示してくれるページ。入力チェックは実施しない。

環境
CakePHP 3.5.10

Controller
src\Controller\BmiController.php

<?php
namespace App\Controller;
use App\Controller\AppController;

class BmiController extends AppController
{
  public function index()
  {
  }

  public function calculate() {
    //$this->autoRender = false;
    $height = $this->request->getData('height') / 100;
    $weight = $this->request->getData('weight');
    $this->set('bmi', round($weight / ($height * $height), 1));
    $this->render('index');
  }
}

Template
src\Template\Bmi\index.ctp

<?php
$this->layout = false;
?>
<!doctype html>
<html lang="ja">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
    <title>bmi calculator</title>
  </head>
  <body>
    <div class="mx-auto" style="width: 400px;">
    <h1>bmi calculator</h1>
    <?php
    echo $this->Form->create('', ['url' => ['action' => 'calculate']]); 
    echo $this->Form->Control('身長(cm)', ['name' => 'height', 'required']);
    echo $this->Form->Control('体重(Kg)', ['name' => 'weight', 'required']);
    echo $this->Form->button('計算する', ['class' => 'btn btn-primary', 'type' => 'submit']);
    echo $this->Form->button('リセット', ['class' => 'btn', 'type' => 'reset']);
    echo $this->Form->end();
    ?>
    <?php if (!empty($bmi)): ?>
      あなたのBMIは<?= $bmi ?>です。
    <?php endif; ?>
    </div>
  </body>
</html>

ControllerとTemplateの作成が終わったらhttp://localhost:8765/bmiにアクセスすると以下のようなページが出力できる。