README

Lazy and naive container for the dependency injection. Require PHP >=7.0.

Use the flyweight design pattern to store a single instance of injectable classes.

Installation

Simply add a dependency on mpstyle/container to your project's composer.json file if you use Composer to manage the dependencies of your project. Here is a minimal example of a composer.json file that just defines a development-time dependency on MpStyle Container:

{
    "require-dev": {
        "mpstyle/container": "1.*.*"
    }
}

or using console:

composer require "mpstyle/container=1.*.*"

Usages

Simple usage of the container:

interface Foo extends Injectable {}

class Dummy implements Injectable {}

class Bar implements Foo {
    public $dummy;

    public function __construct(Dummy $d){ $this->dummy = $d; }
}

$container = new Container();

// add an instance:
$container->addInstance(Foo::class, new Bar());

// or add a definition:
$container->addInstance(Foo::class, Bar::class);

// retrieve an object:
$foo =  $container->getInstance(Foo::class);

// $foo is an instance of Bar, and $dummy property of Bar is initialized as an instance of Dummy.

Closure

It's possible to pass a Closure to the container which contains the logic to instantiate an object:

UniqueContainer::get()->addClosure( Foo::class, function ( Dummy $d ): Foo
{
    return new Bar( $d );
} );

/* @var $serviceB ServiceB */
$foo = UniqueContainer::get()->getInstance( Foo::class );

INI File

It's possible to create a container using a PHP file collecting definitions:

definitions.ini:

mpstyle\container\dummy\Foo = mpstyle\container\dummy\Bar

In your PHP code:

$path = 'definitions.ini';
$container = Container::fromIni($path);
$foo = $container->getInstance(Foo::class);

// $foo is an instance of Bar.

Closure or object are not supported using INI file.

PHP File

It's possible to create a container using a PHP file collecting configurations:

definitions.php:

<?php

return [
    Foo::class => Bar::class
];

In your PHP code:

$path = 'definitions.php';
$container = Container::fromPHP($path);

$this->assertTrue($container->existsKey(Foo::class));

$foo = $container->getInstance(Foo::class);

Singleton instance

Using the wrapper of singleton instance:

interface Foo extends Injectable {}

class Dummy implements Injectable {}

class Bar implements Foo {
    public $dummy;

    public function __construct(Dummy $d){ $this->dummy = $d; }
}

// add an instance:
UniqueContainer::get()->addInstance( Foo::class, new Bar(new Dummy()) );

// or add a definition:
UniqueContainer::get()->addDefinition( Foo::class, Bar::class );

// retrieve an object:
$foo =  UniqueContainer::get()->getInstance(Foo::class);

// $foo is an instance of Bar, and $dummy property of Bar is initialized as an instance of Dummy.

Version

1.5.1: Removed unused classes.
1.5.0: Improved performance and tests.
1.4.0: Added support to load definitions from INI file and to load a container from PHP configuration file.
1.3.1: Little fixes.
1.3.0: Improved performance and stability, deprecated Container#get(string $key) method, use Container#getInstance(string $key) instead.
1.2.0: Added Closure support to the container.
1.1.0
1.0.0

mpstyle / container

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