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quellabs/signal-hub
===================

Type-safe signal/slot event system

1.0.27(2mo ago)0664MITPHP

Since May 11Pushed 1mo ago1 watchersCompare

[ Source](https://github.com/quellabs/signal-hub)[ Packagist](https://packagist.org/packages/quellabs/signal-hub)[ RSS](/packages/quellabs-signal-hub/feed)WikiDiscussions main Synced 1mo ago

READMEChangelog (3)DependenciesVersions (10)Used By (4)

SignalHub: Signal-Slot System for PHP
=====================================

[](#signalhub-signal-slot-system-for-php)

[![Latest Version](https://camo.githubusercontent.com/ce005124e8a655f6f6767b406cbda46c80fb49a090f944eaebe167e05998eabd/68747470733a2f2f696d672e736869656c64732e696f2f7061636b61676973742f762f7175656c6c6162732f7369676e616c2d6875622e737667)](https://packagist.org/packages/quellabs/signal-hub)[![License](https://camo.githubusercontent.com/074b89bca64d3edc93a1db6c7e3b1636b874540ba91d66367c0e5e354c56d0ea/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f6c6963656e73652d4d49542d627269676874677265656e2e737667)](LICENSE)[![Downloads](https://camo.githubusercontent.com/8e7beb323eadea99a265d2213e585e0006297994af8fb8a75740f61ce9d1ad65/68747470733a2f2f696d672e736869656c64732e696f2f7061636b61676973742f64742f7175656c6c6162732f7369676e616c2d6875622e737667)](https://packagist.org/packages/quellabs/signal-hub)

A Qt-inspired signal-slot implementation for PHP. Loose coupling between components through automatic signal discovery, with PHP's type system handling slot type safety.

Installation
------------

[](#installation)

```
composer require quellabs/signal-hub
```

Basic Usage
-----------

[](#basic-usage)

Declare signals as typed properties — your class needs no knowledge of the hub:

```
use Quellabs\SignalHub\Signal;

class MollieController {

    public Signal $paymentPaid;
    public Signal $paymentFailed;

    public function handleWebhook(array $data): void {
        $payment = $this->fetchPayment($data['id']);
        $payment->isPaid() ? $this->paymentPaid->emit($payment) : $this->paymentFailed->emit($payment);
    }
}
```

Connect directly if you hold a reference, or via the hub if you don't. The hub needs to know about the object first — call `registerSignals()` when instantiating it:

```
$hub->registerSignals($controller);

// Then connect directly...
$controller->paymentPaid->connect(fn(Payment $p) => ...);

// ...or via the hub if you don't hold a reference
$hub->getSignal(MollieController::class, 'paymentPaid')->connect(fn(Payment $p) => ...);
```

Standalone signals work without any owning object:

```
$signal = new Signal('app.booted');
$signal->connect(fn() => ...);
$signal->emit();
```

Framework Integration
---------------------

[](#framework-integration)

Call `registerSignals()` from whatever instantiates your objects. The emitting class stays hub-unaware:

```
$hub->registerSignals($controller);

try {
    $controller->handle($request);
} finally {
    $hub->unregisterSignals($controller);
}
```

Consumers connect in their constructor — no controller reference needed:

```
class InventoryService {
    public function __construct(SignalHub $hub) {
        $hub->getSignal(OrderController::class, 'orderPlaced')
            ->connect($this->onOrderPlaced(...));
    }
}
```

Hub API
-------

[](#hub-api)

```
$hub->getSignal(MollieController::class, 'paymentPaid'); // by class name
$hub->getSignal('app.booted');                           // standalone signal
$hub->findSignals('payment.*');                          // wildcard search
$hub->findSignals('payment.*', $controller);             // wildcard + instance
```

Advanced Features
-----------------

[](#advanced-features)

**Priorities** — control slot execution order:

```
$signal->connect($auditHandler, 100);   // runs first
$signal->connect($cleanupHandler, -10); // runs last
```

**Meta-signals** — react to hub activity:

```
$hub->signalRegistered()->connect(function(Signal $signal) {
    if (str_starts_with($signal->getName(), 'payment.')) {
        $signal->connect($this->auditLogger(...));
    }
});
```

Architecture
------------

[](#architecture)

Three classes, no traits:

- **`Signal`** — holds connections, emits to slots (`connect`, `disconnect`, `emit`)
- **`SignalHub`** — registry and rendezvous point (`registerSignals`, `unregisterSignals`, `getSignal`, `findSignals`)
- **`SignalHubLocator`** — optional static accessor for use outside DI contexts

Object-owned signals are stored in a `WeakMap`, so they're garbage collected when the owning object goes out of scope.

License
-------

[](#license)

MIT

###  Health Score

40

—

FairBetter than 88% of packages

Maintenance88

Actively maintained with recent releases

Popularity11

Limited adoption so far

Community11

Small or concentrated contributor base

Maturity43

Maturing project, gaining track record

How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window.

**Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores.

**Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement.

**Maturity (30%)** — Project age, version count, PHP version support, and release stability.

###  Release Activity

Cadence

Every ~37 days

Recently: every ~57 days

Total

9

Last Release

66d ago

### Community

Maintainers

![](https://www.gravatar.com/avatar/57e4ab872b3e37536367f2d26b192df3d3bb6a6a1cebec9a104d14a6d2ffe157?d=identicon)[noescom](/maintainers/noescom)

### Embed Badge

![Health badge](/badges/quellabs-signal-hub/health.svg)

```
[![Health](https://phpackages.com/badges/quellabs-signal-hub/health.svg)](https://phpackages.com/packages/quellabs-signal-hub)
```

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