Multiple nested Doctrine2 EntityManager transactions pseudo-code

nested-transactions.php

<?php

use doctrine\ORM\EntityManagerInterface;

$entityManager->transactional(function (EntityManagerInterface $entityManager) {
    // first transaction

    $entityManager->transactional(function () {
        // nested transaction #1
    });

    $entityManager->transactional(function () {
        // nested transaction #2
    });
});