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Example code of fast-forward/clock

Informations about the package clock

FastForward\Clock

PHP Version Composer Package PSR-20 Tests Coverage License

FastForward\Clock provides PSR-20 compliant clock implementations and seamless integration with Fast Forward Container.

This package offers two clock implementations: SystemClock for production time and FrozenClock for deterministic testing.

✨ Features

📦 Installation

Requirements:

🛠️ Usage

Basic: Get the current time

The simplest way to get the current time is using SystemClock:

With a specific timezone

Using with Fast Forward Container

For larger applications, use the service provider to register the clock in your container:

Freezing time for tests

Use FrozenClock to create deterministic tests:

FrozenClock accepts multiple input formats:

Using FrozenClock with Fast Forward Container in tests

🧰 API Summary

Class Description
FastForward\Clock\SystemClock PSR-20 clock that returns current system time with optional timezone
FastForward\Clock\FrozenClock PSR-20 clock that returns a fixed time (ideal for testing)
FastForward\Clock\ServiceProvider\ClockServiceProvider Registers clock services in Fast Forward Container

SystemClock Constructor

Parameter Type Description
$timezone DateTimeZone\|string\|null Timezone for the clock (defaults to system default)

FrozenClock Constructor

Parameter Type Description
$clock DateTimeInterface\|ClockInterface\|string\|int\|float The time to freeze. Accepts DateTimeImmutable, string (relative or absolute), timestamp, or another ClockInterface

🔌 Integration

This package integrates seamlessly with:

📁 Directory Structure

⚙️ Advanced / Customization

Custom timezone via configuration

If you use Fast Forward Config, you can configure the default timezone:

Creating a custom clock

Both clocks are final readonly classes, but you can wrap them:

❓ FAQ

Q: What's the difference between SystemClock and FrozenClock?
A: SystemClock returns the current time and is suitable for production. FrozenClock returns a fixed time and is ideal for testing.

Q: Which interface should I use in my application?
A: Use Psr\Clock\ClockInterface for maximum portability. Both implementations satisfy this interface.

Q: How do I freeze time in tests?
A: Use FrozenClock directly, or register it via ArrayServiceProvider before ClockServiceProvider.

Q: Can I use this without Fast Forward Container?
A: Yes! Simply instantiate SystemClock or FrozenClock directly in your code.

Q: Does this work with other PSR-11 containers?
A: Yes. The clocks are standalone classes that don't require any container.

Q: How do I set a specific timezone?
A: Pass a timezone string or DateTimeZone instance to the SystemClock constructor.

🛡 License

This project is licensed under the MIT License.

🤝 Contributing

Issues, documentation improvements, and pull requests are welcome!

🔗 Links

All versions of clock with dependencies

PHP Build Version
Package Version
Requires php Version ^8.3
fast-forward/config Version ^1.4
fast-forward/container Version ^1.6
psr/clock Version ^1.0
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