Skip to main content

UUIDv4

UUIDv4 is a random-based UUID — every UUID is generated using cryptographic randomness, making collisions statistically improbable.

It contains no embedded metadata and is ideal when uniqueness is the only concern.

Generate a UUIDv4​

use DomainFlow\Uuid\UuidV4;

$uuid = UuidV4::generate();
echo (string) $uuid;

Validate a UUIDv4​

UuidV4::isValid('f47ac10b-58cc-4372-a567-0e02b2c3d479');

Inspector Output​

use DomainFlow\Uuid\Inspector;

$metadata = Inspector::analyze((string) $uuid)->metadata();

Returns:

[
  'entropy_source' => 'Cryptographic random bytes',
  'deterministic' => false,
  'note' => 'UUIDv4 contains no embedded metadata'
]

Use Cases​

  • Universally unique IDs with no ordering or predictability
  • Public identifiers (e.g. URLs, tokens)
  • Safe for high-scale distributed systems with low collision risk

💡 Tip: UUIDv4 is one of the most common and widely supported UUID types — great default for most use cases where uniqueness is the priority.