The UID Component

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use Symfony\Component\Uid\Uuid;

// UUID type 1 generates the UUID using the MAC address of your device and a timestamp.
// Both are obtained automatically, so you don't have to pass any constructor argument.
$uuid = Uuid::v1(); // $uuid is an instance of Symfony\Component\Uid\UuidV1

// UUID type 4 generates a random UUID, so you don't have to pass any constructor argument.
$uuid = Uuid::v4(); // $uuid is an instance of Symfony\Component\Uid\UuidV4

// UUID type 3 and 5 generate a UUID hashing the given namespace and name. Type 3 uses
// MD5 hashes and Type 5 uses SHA-1. The namespace is another UUID (e.g. a Type 4 UUID)
// and the name is an arbitrary string (e.g. a product name; if it's unique).
$namespace = Uuid::v4();
$name = $product->getUniqueName();

$uuid = Uuid::v3($namespace, $name); // $uuid is an instance of Symfony\Component\Uid\UuidV3
$uuid = Uuid::v5($namespace, $name); // $uuid is an instance of Symfony\Component\Uid\UuidV5

// the namespaces defined by RFC 4122 (see https://tools.ietf.org/html/rfc4122#appendix-C)
// are available as PHP constants and as string values
$uuid = Uuid::v3(Uuid::NAMESPACE_DNS, $name);  // same as: Uuid::v3('dns', $name);
$uuid = Uuid::v3(Uuid::NAMESPACE_URL, $name);  // same as: Uuid::v3('url', $name);
$uuid = Uuid::v3(Uuid::NAMESPACE_OID, $name);  // same as: Uuid::v3('oid', $name);
$uuid = Uuid::v3(Uuid::NAMESPACE_X500, $name); // same as: Uuid::v3('x500', $name);

// UUID type 6 is not yet part of the UUID standard. It's lexicographically sortable
// (like ULIDs) and contains a 60-bit timestamp and 63 extra unique bits.
// It's defined in https://www.ietf.org/archive/id/draft-peabody-dispatch-new-uuid-format-04.html#name-uuid-version-6
$uuid = Uuid::v6(); // $uuid is an instance of Symfony\Component\Uid\UuidV6

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namespace App\Service;

use Symfony\Component\Uid\Factory\UuidFactory;

class FooService
{
    private UuidFactory $uuidFactory;

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

    public function generate(): void
    {
        // This creates a UUID of the version given in the configuration file (v6 by default)
        $uuid = $this->uuidFactory->create();

        $nameBasedUuid = $this->uuidFactory->nameBased(/** ... */);
        $randomBasedUuid = $this->uuidFactory->randomBased();
        $timestampBased = $this->uuidFactory->timeBased();

        // ...
    }
}

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use Symfony\Component\Uid\NilUuid;
use Symfony\Component\Uid\Uuid;

// checking if the UUID is null (note that the class is called
// NilUuid instead of NullUuid to follow the UUID standard notation)
$uuid = Uuid::v4();
$uuid instanceof NilUuid; // false

// checking the type of UUID
use Symfony\Component\Uid\UuidV4;
$uuid = Uuid::v4();
$uuid instanceof UuidV4; // true

// getting the UUID datetime (it's only available in certain UUID types)
$uuid = Uuid::v1();
$uuid->getDateTime(); // returns a \DateTimeImmutable instance

// checking if a given value is valid as UUID
$isValid = Uuid::isValid($uuid); // true or false

// comparing UUIDs and checking for equality
$uuid1 = Uuid::v1();
$uuid4 = Uuid::v4();
$uuid1->equals($uuid4); // false

// this method returns:
//   * int(0) if $uuid1 and $uuid4 are equal
//   * int > 0 if $uuid1 is greater than $uuid4
//   * int < 0 if $uuid1 is less than $uuid4
$uuid1->compare($uuid4); // e.g. int(4)

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// src/Entity/Product.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="App\Repository\ProductRepository")
 */
class Product
{
    /**
     * @ORM\Column(type="uuid")
     */
    private $someProperty;

    // ...
}

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namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Uid\Uuid;

class User implements UserInterface
{
    /**
     * @ORM\Id
     * @ORM\Column(type="uuid", unique=true)
     * @ORM\GeneratedValue(strategy="CUSTOM")
     * @ORM\CustomIdGenerator(class="doctrine.uuid_generator")
     */
    private $id;

    public function getId(): ?Uuid
    {
        return $this->id;
    }

    // ...
}

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// src/Repository/ProductRepository.php

// ...
class ProductRepository extends ServiceEntityRepository
{
    // ...

    public function findUserProducts(User $user): array
    {
        $qb = $this->createQueryBuilder('p')
            // ...
            // add 'uuid' as the third argument to tell Doctrine that this is a UUID
            ->setParameter('user', $user->getUuid(), 'uuid')

            // alternatively, you can convert it to a value compatible with
            // the type inferred by Doctrine
            ->setParameter('user', $user->getUuid()->toBinary())
        ;

        // ...
    }
}

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namespace App\Service;

use Symfony\Component\Uid\Factory\UlidFactory;

class FooService
{
    private UlidFactory $ulidFactory;

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

    public function generate(): void
    {
        $ulid = $this->ulidFactory->create();

        // ...
    }
}

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use Symfony\Component\Uid\Ulid;

$ulid1 = new Ulid();
$ulid2 = new Ulid();

// checking if a given value is valid as ULID
$isValid = Ulid::isValid($ulidValue); // true or false

// getting the ULID datetime
$ulid1->getDateTime(); // returns a \DateTimeImmutable instance

// comparing ULIDs and checking for equality
$ulid1->equals($ulid2); // false
// this method returns $ulid1 <=> $ulid2
$ulid1->compare($ulid2); // e.g. int(-1)

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// src/Entity/Product.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="App\Repository\ProductRepository")
 */
class Product
{
    /**
     * @ORM\Column(type="ulid")
     */
    private $someProperty;

    // ...
}

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namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Uid\Ulid;

class Product
{
    /**
     * @ORM\Id
     * @ORM\Column(type="ulid", unique=true)
     * @ORM\GeneratedValue(strategy="CUSTOM")
     * @ORM\CustomIdGenerator(class="doctrine.ulid_generator")
     */
    private $id;

    public function getId(): ?Ulid
    {
        return $this->id;
    }

    // ...

}

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// src/Repository/ProductRepository.php

// ...
class ProductRepository extends ServiceEntityRepository
{
    // ...

    public function findUserProducts(User $user): array
    {
        $qb = $this->createQueryBuilder('p')
            // ...
            // add 'ulid' as the third argument to tell Doctrine that this is a ULID
            ->setParameter('user', $user->getUlid(), 'ulid')

            // alternatively, you can convert it to a value compatible with
            // the type inferred by Doctrine
            ->setParameter('user', $user->getUlid()->toBinary())
        ;

        // ...
    }
}