创建和使用模板

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// src/Controller/ProductController.php
namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;

class ProductController extends AbstractController
{
    public function index(): Response
    {
        // ...

        // the `render()` method returns a `Response` object with the
        // contents created by the template
        return $this->render('product/index.html.twig', [
            'category' => '...',
            'promotions' => ['...', '...'],
        ]);

        // the `renderView()` method only returns the contents created by the
        // template, so you can use those contents later in a `Response` object
        $contents = $this->renderView('product/index.html.twig', [
            'category' => '...',
            'promotions' => ['...', '...'],
        ]);

        return new Response($contents);
    }
}

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// src/Controller/ProductController.php
namespace App\Controller;

use Symfony\Bridge\Twig\Attribute\Template;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;

class ProductController extends AbstractController
{
    #[Template('product/index.html.twig')]
    public function index(): array
    {
        // ...

        // when using the #[Template] attribute, you only need to return
        // an array with the parameters to pass to the template (the attribute
        // is the one which will create and return the Response object).
        return [
            'category' => '...',
            'promotions' => ['...', '...'],
        ];
    }
}

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// src/Controller/ProductController.php
namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;

class ProductController extends AbstractController
{
    // ...

    public function price(): Response
    {
        // ...

        // the `renderBlock()` method returns a `Response` object with the
        // block contents
        return $this->renderBlock('product/index.html.twig', 'price_block', [
            // ...
        ]);

        // the `renderBlockView()` method only returns the contents created by the
        // template block, so you can use those contents later in a `Response` object
        $contents = $this->renderBlockView('product/index.html.twig', 'price_block', [
            // ...
        ]);

        return new Response($contents);
    }
}

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// src/Controller/ProductController.php
namespace App\Controller;

use Symfony\Bridge\Twig\Attribute\Template;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;

class ProductController extends AbstractController
{
    #[Template('product.html.twig', block: 'price_block')]
    public function price(): array
    {
        return [
            // ...
        ];
    }
}

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// src/Service/SomeService.php
namespace App\Service;

use Twig\Environment;

class SomeService
{
    public function __construct(
        private Environment $twig,
    ) {
    }

    public function someMethod(): void
    {
        // ...

        $htmlContents = $this->twig->render('product/index.html.twig', [
            'category' => '...',
            'promotions' => ['...', '...'],
        ]);
    }
}

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use Twig\Environment;

class YourService
{
    // this code assumes that your service uses autowiring to inject dependencies
    // otherwise, inject the service called 'twig' manually
    public function __construct(Environment $twig)
    {
        $loader = $twig->getLoader();
    }
}

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// src/Controller/BlogController.php
namespace App\Controller;

use Symfony\Component\HttpFoundation\Response;
// ...

class BlogController extends AbstractController
{
    public function recentArticles(int $max = 3): Response
    {
        // get the recent articles somehow (e.g. making a database query)
        $articles = ['...', '...', '...'];

        return $this->render('blog/_recent_articles.html.twig', [
            'articles' => $articles
        ]);
    }
}

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// src/Twig/AppExtension.php
namespace App\Twig;

use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;

class AppExtension extends AbstractExtension
{
    public function getFilters(): array
    {
        return [
            new TwigFilter('price', [$this, 'formatPrice']),
        ];
    }

    public function formatPrice(float $number, int $decimals = 0, string $decPoint = '.', string $thousandsSep = ','): string
    {
        $price = number_format($number, $decimals, $decPoint, $thousandsSep);
        $price = '$'.$price;

        return $price;
    }
}

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// src/Twig/AppExtension.php
namespace App\Twig;

use Twig\Extension\AbstractExtension;
use Twig\TwigFunction;

class AppExtension extends AbstractExtension
{
    public function getFunctions(): array
    {
        return [
            new TwigFunction('area', [$this, 'calculateArea']),
        ];
    }

    public function calculateArea(int $width, int $length): int
    {
        return $width * $length;
    }
}

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// src/Twig/AppExtension.php
namespace App\Twig;

use App\Twig\AppRuntime;
use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;

class AppExtension extends AbstractExtension
{
    public function getFilters(): array
    {
        return [
            // the logic of this filter is now implemented in a different class
            new TwigFilter('price', [AppRuntime::class, 'formatPrice']),
        ];
    }
}

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// src/Twig/AppRuntime.php
namespace App\Twig;

use Twig\Extension\RuntimeExtensionInterface;

class AppRuntime implements RuntimeExtensionInterface
{
    public function __construct()
    {
        // this simple example doesn't define any dependency, but in your own
        // extensions, you'll need to inject services using this constructor
    }

    public function formatPrice(float $number, int $decimals = 0, string $decPoint = '.', string $thousandsSep = ','): string
    {
        $price = number_format($number, $decimals, $decPoint, $thousandsSep);
        $price = '$'.$price;

        return $price;
    }
}