phpnomad/singleton

phpnomad/singleton is a single-trait package for PHPNomad. It provides WithInstance, a trait that gives any class a static instance() method returning a lazily-created, per-class singleton. It has zero runtime dependencies and is what phpnomad/facade and the rest of the framework use whenever a class needs a single shared instance without reaching for a container.

Installation

composer require phpnomad/singleton

Quick Start

Add the trait to a class, then call instance() to get the shared object.

<?php

use PHPNomad\Singleton\Traits\WithInstance;

class Registry
{
    use WithInstance;

    private array $items = [];

    public function register(string $key, $value): void
    {
        $this->items[$key] = $value;
    }

    public function get(string $key)
    {
        return $this->items[$key] ?? null;
    }
}

Registry::instance()->register('theme', 'dark');
$theme = Registry::instance()->get('theme'); // 'dark'

Every call to Registry::instance() returns the same object for the lifetime of the request.

Overview

The package is intentionally tiny. The trait adds a protected static $instance property and a public static instance() method, and nothing else.

• Lazy initialization, so the instance is only built the first time instance() is called
• Late static binding (new static), so subclasses each get their own singleton rather than sharing the parent's
• Zero runtime dependencies, which means adding it to a project pulls in nothing else
• Lives under the PHPNomad\Singleton\Traits namespace, importable via use PHPNomad\Singleton\Traits\WithInstance;
• Used by phpnomad/facade to back its static service facades across the framework

Documentation

The full package guide, including inheritance behavior, testing strategies, and when to reach for a DI container instead, lives at phpnomad.com.

License

MIT, see LICENSE.txt for the full text.