A high-performance PHP extension for working with 128-bit identifiers including UUIDs and ULIDs.

• 128-bit Base Class: Identifier\Bit128 for all 128-bit identifiers
• Complete UUID Support: All UUID versions (1, 3, 4, 5, 6, 7) with proper RFC compliance
• ULID Support: Universally Unique Lexicographically Sortable Identifiers with monotonic ordering
• Thread Safety: Full thread safety for ULID monotonic generation using TSRM (Thread Safe Resource Manager)
• State System: Deterministic generation for testing with State\Fixed
• Exceptional Performance: Native C implementation delivering 9.9M+ ULID ops/sec, 2.8M+ UUID ops/sec
• Type Safety: Proper PHP class hierarchy with inheritance

• PHP 8.3 or higher
• Zig 0.15.2+ (Download from ziglang.org) - The amazing build system that makes this all possible

If you use devenv, the repository includes a ready-to-use environment with PHP, PHP development headers (php-config), Composer, Zig, and ZLS:

devenv shell

Inside the devenv shell, you can use the provided helper scripts:

build # zig build
test  # zig build + PHPUnit
dev   # zig build dev
bench # zig build + composer install + composer bench

git clone https://github.com/your-org/php-ext-identifier.git
cd php-ext-identifier
zig build dev  # Build + test in one command

For production installation:

zig build install-system  # Install to system PHP (requires sudo)

Add to your php.ini:

extension=identifier

use Identifier\Uuid\Version4;
use Identifier\Uuid\Version7;
use Identifier\Ulid;

// Generate random UUID v4
$uuid = Version4::generate();
echo $uuid->toString(); // e.g., "550e8400-e29b-41d4-a716-446655440000"

// Generate timestamp-based UUID v7
$uuid7 = Version7::generate();
echo $uuid7->toString();

// Generate ULID
$ulid = Ulid::generate();
echo $ulid->toString(); // e.g., "01ARZ3NDEKTSV4RRFFQ69G5FAV"

use Identifier\State\Fixed;
use Identifier\Uuid\Version4;

// Create deterministic state for testing
$ctx = Fixed::create(1640995200000, 12345);

// Generate deterministic UUIDs
$uuid1 = Version4::generate($ctx);
$uuid7 = Version7::generate($ctx);
$ulid = Ulid::generate($ctx);

// Both calls with same state will produce same results

This extension is fully thread-safe for ULID monotonic generation in multi-threaded PHP environments (ZTS builds). The implementation uses PHP's TSRM (Thread Safe Resource Manager) to ensure proper thread isolation.

• Thread Isolation: Each thread maintains its own monotonic state (last timestamp and randomness)
• Zero Contention: No locks or synchronization required - each thread operates independently
• Monotonic Ordering: ULIDs generated within a single thread are guaranteed to be monotonically increasing
• Performance: Thread safety comes with zero performance overhead

• ✅ Apache mod_php (both threaded and non-threaded)
• ✅ Apache mod_worker (requires ZTS PHP build)
• ✅ Windows IIS (requires ZTS PHP build)
• ✅ PHP-FPM (process-based, inherently thread-safe)
• ✅ CLI (single-threaded by default)

The same extension binary works for both ZTS (thread-safe) and non-ZTS PHP builds:

# Check if your PHP build supports threading
php -m | grep -i zts
php-config --configure-options | grep -i zts

For web servers that use threading (like Apache mod_worker or IIS), ensure you're using a ZTS PHP build to get full thread safety benefits.

Check the stub file for a detailed API documentation.

Tests are written with PHPUnit under test/Test and are run against the locally built extension.

zig build test      # Build the extension and run PHPUnit
zig build dev       # Build + test
composer test       # Run PHPUnit after the extension has been built

With devenv:

devenv shell test   # Build and run PHPUnit inside the managed environment
devenv test         # Validate the environment and run the test suite

Benchmarks use PHPBench and compare this extension against symfony/uid and ramsey/uuid.

zig build
composer install
composer bench

With devenv:

devenv shell bench

1. Fork the repository
2. Create a feature branch
3. Add tests for new functionality
4. Ensure all tests pass (zig build test)
5. Submit a pull request

This project is licensed under the MIT License - see the LICENSE file for details.

• Zig Programming Language - This project is built using Zig's incredible embedded C compiler and build system. Zig's seamless C interop, cross-compilation capabilities, and modern build tooling make it the perfect choice for PHP extension development. Special thanks to the Zig team for creating such an outstanding development experience.
• devenv - Provides a reproducible development environment for PHP extension work, including PHP development tooling, Composer, Zig, and ZLS.
• RFC 4122 - UUID specification
• RFC 9562 - Updated UUID specification
• ULID Specification - ULID format specification