扩展 Twig

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class CustomSetTokenParser extends \Twig\TokenParser\AbstractTokenParser
{
    public function parse(\Twig\Token $token)
    {
        $parser = $this->parser;
        $stream = $parser->getStream();

        $name = $stream->expect(\Twig\Token::NAME_TYPE)->getValue();
        $stream->expect(\Twig\Token::OPERATOR_TYPE, '=');
        $value = $parser->getExpressionParser()->parseExpression();
        $stream->expect(\Twig\Token::BLOCK_END_TYPE);

        return new CustomSetNode($name, $value, $token->getLine());
    }

    public function getTag()
    {
        return 'set';
    }
}

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class CustomSetNode extends \Twig\Node\Node
{
    public function __construct($name, \Twig\Node\Expression\AbstractExpression $value, $line)
    {
        parent::__construct(['value' => $value], ['name' => $name], $line);
    }

    public function compile(\Twig\Compiler $compiler)
    {
        $compiler
            ->addDebugInfo($this)
            ->write('$context[\''.$this->getAttribute('name').'\'] = ')
            ->subcompile($this->getNode('value'))
            ->raw(";\n")
        ;
    }
}

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class CustomTwigExtension extends \Twig\Extension\AbstractExtension implements \Twig\Extension\GlobalsInterface
{
    public function getGlobals(): array
    {
        return [
            'text' => new Text(),
        ];
    }

    // ...
}

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class CustomTwigExtension extends \Twig\Extension\AbstractExtension
{
    public function getFunctions()
    {
        return [
            new \Twig\TwigFunction('lipsum', 'generate_lipsum'),
        ];
    }

    // ...
}

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class CustomTwigExtension extends \Twig\Extension\AbstractExtension
{
    public function getFilters()
    {
        return [
            new \Twig\TwigFilter('rot13', 'str_rot13'),
        ];
    }

    // ...
}

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class CustomTwigExtension extends \Twig\Extension\AbstractExtension
{
    public function getTests()
    {
        return [
            new \Twig\TwigTest('even', 'twig_test_even'),
        ];
    }

    // ...
}

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class CustomTwigExtension extends \Twig\Extension\AbstractExtension
{
    private $rot13Provider;

    public function __construct($rot13Provider)
    {
        $this->rot13Provider = $rot13Provider;
    }

    public function getFunctions()
    {
        return [
            new \Twig\TwigFunction('rot13', [$this, 'rot13']),
        ];
    }

    public function rot13($value)
    {
        return $this->rot13Provider->rot13($value);
    }
}

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class RuntimeLoader implements \Twig\RuntimeLoader\RuntimeLoaderInterface
{
    public function load($class)
    {
        // implement the logic to create an instance of $class
        // and inject its dependencies
        // most of the time, it means using your dependency injection container
        if ('CustomTwigRuntime' === $class) {
            return new $class(new Rot13Provider());
        } else {
            // ...
        }
    }
}

$twig->addRuntimeLoader(new RuntimeLoader());

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class CustomTwigRuntime
{
    private $rot13Provider;

    public function __construct($rot13Provider)
    {
        $this->rot13Provider = $rot13Provider;
    }

    public function rot13($value)
    {
        return $this->rot13Provider->rot13($value);
    }
}

class CustomTwigExtension extends \Twig\Extension\AbstractExtension
{
    public function getFunctions()
    {
        return [
            new \Twig\TwigFunction('rot13', ['CustomTwigRuntime', 'rot13']),
            // or
            new \Twig\TwigFunction('rot13', 'CustomTwigRuntime::rot13'),
        ];
    }
}

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Fixtures/
    filters/
        lower.test
        upper.test
    functions/
        date.test
        format.test
    tags/
        for.test
        if.test
IntegrationTest.php

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namespace Project\Tests;

use Twig\Test\IntegrationTestCase;

class IntegrationTest extends IntegrationTestCase
{
    public function getExtensions()
    {
        return [
            new CustomTwigExtension1(),
            new CustomTwigExtension2(),
        ];
    }

    public function getFixturesDir()
    {
        return __DIR__.'/Fixtures/';
    }
}