<?php
use Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper\ProxyDumper;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Dumper\PhpDumper;
include_once __DIR__. '/../vendor/autoload.php';
$container = new ContainerBuilder();
$container->setParameter('container.dumper.inline_class_loader', true);
$container
    ->register(\Acme\MyClass::class, \Acme\MyClass::class)
    ->setShared(false)
    ->setLazy(true)
    ->setPublic(true);
$container->compile();
$dumper = new PhpDumper($container);
$dumper->setProxyDumper(new ProxyDumper());
$dump = $dumper->dump([
    'as_files' => true,
    'file' => 'cache/appAppKernelDevDebugContainer.php',
]);
print_r($dump);

<?php
namespace Acme;
class MyClassParent {}

<?php
namespace Acme;
class MyClass extends MyClassParent {}

<?php

use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
use Symfony\Component\DependencyInjection\Exception\RuntimeException;

// This file has been auto-generated by the Symfony Dependency Injection Component for internal use.
// Returns the public 'Acme\MyClass' service.

if ($lazyLoad) {
    return $this->createProxy('MyClass_d0c7b87', function () {
        return \MyClass_d0c7b87::staticProxyConstructor(function (&$wrappedInstance, \ProxyManager\Proxy\LazyLoadingInterface $proxy) {
            $wrappedInstance = $this->factories['Acme\\MyClass'](false);

            $proxy->setProxyInitializer(null);

            return true;
        });
    });
}

include_once \dirname(__DIR__, 2).'/src/MyClassParent.php';
include_once \dirname(__DIR__, 2).'/src/MyClass.php';

$this->factories['Acme\\MyClass'] = function ($lazyLoad = true) {
    return new \Acme\MyClass();
};

return $this->factories['Acme\\MyClass']();