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@ 2024-10-23T15:48:45Z

<?php

final readonly class Post
{
    public int $id;
    public string $name;
    public string $email;

    public function greet(): string
    {
        return "Hello 👋";
    }
}

final readonly class PostRepository
{
    private ReflectionClass $reflector;

    public function __construct(
    ) {
        $this->reflector = new ReflectionClass(Post::class);
    }

    public function find(int $id): Post
    {
        var_dump("Loading post with ID $id");

        $entity = $this->reflector->newLazyGhost(function ($entity) use ($id) {
            var_dump("Lazy initialization triggered for ID $id");

            $data = $this->loadFromDatabase($id);
            $this->reflector->getProperty('name')->setValue($entity, $data['name']);
            $this->reflector->getProperty('email')->setValue($entity, $data['email']);
        });

        // ID is already known and can be accessed without triggering initialization
        $this->reflector->getProperty('id')->setRawValueWithoutLazyInitialization($entity, $id);

        return $entity;
    }

    private function loadFromDatabase(int $id): array
    {
        // Simulate loading from database
        return [
            'name' => 'John Doe',
            'email' => 'john.doe@example.com',
        ];
    }
}

$em = new PostRepository();
$post = $em->find(42);
var_dump($post);
var_dump($post->greet());
// This will really trigger the lazy initialization
$post->email;
var_dump($post);

Output for 8.4.1 - 8.4.14, 8.5.0: string(23) "Loading post with ID 42" lazy ghost object(Post)#4 (1) { ["id"]=> int(42) ["name"]=> uninitialized(string) ["email"]=> uninitialized(string) } string(10) "Hello 👋" string(39) "Lazy initialization triggered for ID 42" object(Post)#4 (3) { ["id"]=> int(42) ["name"]=> string(8) "John Doe" ["email"]=> string(20) "john.doe@example.com" }
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.2.23 - 8.2.29, 8.3.5 - 8.3.28: string(23) "Loading post with ID 42" Fatal error: Uncaught Error: Call to undefined method ReflectionClass::newLazyGhost() in /in/XNRiS:28 Stack trace: #0 /in/XNRiS(53): PostRepository->find(42) #1 {main} thrown in /in/XNRiS on line 28
Process exited with code 255.
Output for 8.1.30 - 8.1.33: Parse error: syntax error, unexpected token "readonly", expecting "abstract" or "final" or "class" in /in/XNRiS on line 3
Process exited with code 255.

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