<?php

use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Component\DependencyInjection\Reference;

class Foo
{
}

class Bar
{
}

$fooDefinition = new Definition('Foo');
// In 2.X it was setScope() set to prototype
$fooDefinition->setShared(false);
$fooDefinition->setPublic(true);

$barDefinition = new Definition('Bar');
$barDefinition->setPublic(true);

// set definitions in container builder
$containerBuilder = new ContainerBuilder();
$containerBuilder->setDefinition('foo', $fooDefinition);
$containerBuilder->setDefinition('bar', $barDefinition);

// calling bar service
$bar1 = $containerBuilder->get('bar');
$bar2 = $containerBuilder->get('bar');
dump($bar1 === $bar2);

// calling foo service
$foo1 = $containerBuilder->get('foo');
$foo2 = $containerBuilder->get('foo');
dump($foo1 === $foo2);

^ true

^ false

• Symfony DI Container outside Symfony
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PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8