带规则的symfony 4计数方法

// src/Service/CountService.php

namespace App\Service;

class CountService
{
    public function countWithRule($numbers)
    {
        $count = 0;
        
        foreach ($numbers as $number) {
            if ($number % 2 == 0) {
                $count++;
            }
        }
        
        return $count;
    }
}

# config/services.yaml

services:
    App\Service\CountService:
        arguments: []

// src/Controller/DefaultController.php

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;
use App\Service\CountService;

class DefaultController extends AbstractController
{
    /**
     * @Route("/", name="homepage")
     */
    public function index(CountService $countService): Response
    {
        $numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
        $count = $countService->countWithRule($numbers);
        
        return $this->render('default/index.html.twig', [
            'count' => $count,
        ]);
    }
}