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Informations about the package cobalt

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Cobalt — An Autowired Dependency Injection Container for PHP

Realized in fewer than 200 lines of source.

Well documented, perfect for building/learning.

100% line and method coverage on PHP 8.2, 8.3, and 8.4.

One of the fastest PHP dynamic autowired containers available.

Cobalt was created to push the performance limits of what a PHP-based dynamic autowired DI container can achieve. Container::class implements the PSR-11 ContainerInterface and provides many of the features found in more notable container projects. Resolution closures are cached after the first build, so subsequent lookups skip all reflection work. Cobalt and its simple, heavily commented source are perfect for learning, or for embedding inside projects and frameworks.

The Cobalt service container has the following features:

  1. Single class container implementing the PSR-11 ContainerInterface v2.
  2. ArrayAccess methods for container bindings.
  3. Constructor injection of type-hinted dependencies.
  4. Dependency injection through bind() method closures.
  5. Autowired dependency resolution using Reflection.
  6. Top-down inversion of control (IoC).
  7. Shared mode option (singleton only).
  8. Bind existing instances into the container.
  9. A self-binding global container instance.

Installation

Usage

Creating the container

Binding into the container

Binding does not instantiate the class. Instantiation is deferred until the binding is requested from the container. bind() accepts three parameters: the abstract name, the concrete implementation, and a boolean for whether the binding is a singleton. The abstract name is free-form and acts as the key in the binding registry.

bind(string $abstract, mixed $concrete = null, bool $singleton = false): void

Resolving out of the container

$instance = resolve(string $id): mixed (resolve checks for an existing binding before instantiating)

Trying to resolve a missing binding throws NotFoundException per PSR-11.

Using the make() method

make() is bind() then resolve() — useful for one-shot instantiation.

$instance = make(string $abstract, mixed ...$args): mixed

Creating an alias to a binding

alias(string $alias, string $binding): void

Allows creating additional string IDs for accessing existing container bindings.

Binding an existing instance

Pass an object to bind() and Cobalt registers it as a singleton automatically (a pre-built instance is by definition shared).

Checking if a binding exists

$bool = has(string $abstract): bool

Getting the values of a single binding

$array = getBinding(string $abstract): array

Getting a list of bindings

$array = getBindings(): array

Development

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License

The MIT License (MIT). Please see License File for more information.

All versions of cobalt with dependencies

PHP Build Version
Package Version
Requires php Version ^8.2
psr/container Version ^2.0
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