README.md

Parable DI Container

Parable DI is a no-nonsense dependency injection container that gets the job done.

Install

Php 8.0+ and composer are required.

$ composer require parable-php/di

Usage

Example usage of a straightforward situation:

use \Parable\Di\Container;

$container = new Container();

$app = $container->get(App::class);
$app->run();

Example usage of an interface-hinted dependency being mapped:

use \Parable\Di\Container;

$container = new Container();

class App
{
    public function __construct(ThatInterface $classWithThatInterface)
    {
    }
    
    public function run()
    {
        echo "Run? RUN!";
    }
}

$container->map(ThatInterface::class, ClassWithThatInterface::class);

$app = $container->get(App::class);
$app->run();

The above situation can also be solved by instantiating and then storing ClassWithThatInterface under ThatInterface.

Example usage of a class that needs the di itself, in case you need to do dynamic DI:

use \Parable\Di\Container;

$container = new Container();

class App
{
    public $container;
    public function __construct(
        public Container $container
    ) {}
}

$app = $container->get(App::class);
var_dump($app->container->has(App::class)); // output: bool(true)

For all other use cases, simply check the tests in tests/ContainerTest.php.

API

• get(string $name): object - creates or gets instance
• has(string $name): bool - check if instance is stored
• assertHas(string $name): void - check and throw exception if instance is not stored
• build(string $name): object - build instance with stored deps, don't store
• buildAll(string $name): object - build instance with new deps, don't store
• map(string $requested, string $replacement): void - allow pre-emptively defining a replacement class to be instantiated when the requested name is retrieved or built. Use for lazy-loading classes, i.e. for interface deps.
• unmap(string $requested): void - removes the mapping and clears any previously mapped instances
• getDependenciesFor(string $name, [int $storedDependencies]): array - get dependencies for instance, with stored (default) or new deps
• store(object $instance, [string $name]): void - store instance under name, or under instance name by default
• clear(string $name): void - clear instance
• clearExcept(array $keep): void - clear all except provided names, throws if any of the instances to keep doesn't exist
• clearAll(): void - clear all

Where object refers to any instance of any class.

Contributing

Any suggestions, bug reports or general feedback is welcome. Use github issues and pull requests, or find me over at devvoh.com.

License

All Parable components are open-source software, licensed under the MIT license.