🌴 Palmtree Container

A PSR-11 compatible service container

Supports environment variable parameters, factories and private services.

Requirements

• PHP >= 7.1

For PHP >= 5.6 support use v1.0

Installation

Use composer to add the package to your dependencies:

composer require palmtree/container

Usage

Define parameters and services:

# config.yml
parameters:
  database_name: 'mydb'
  database_user: 'mydb_user'
  database_password: '%env(DB_PASSWORD)%'
  env(DB_PASSWORD): 123456 # Default env parameter used if environment variable is not set

imports:
  - { resource: services.yml }
  - { resource: secrets.yml }

# services.yml
services:
  my_service:
    class: MyNamespace\MyService
    arguments: [arg1, '%database_name%']

  my_other_service:
    class: MyNamespace\MyOtherService
    arguments: ['@my_service']
    calls:
      -
        method: doThing
        arguments: [arg1, arg2]
      

# secrets.yml
parameters:
    secret: 'TopsyCrett'

Create container:

<?php
use Palmtree\Container\ContainerFactory;

$container = ContainerFactory::create('config.yml');

$container->get('my_service')->myMethod();

$container->getParameter('db_username');

Advanced Usage

Factories

Services can be created by calling static factory methods. Arguments are passed to the factory method.

# services.yml
services:
  my_service:
    factory: 'MyNamespace\MyFactory:createService'
    arguments: [argForCreateService]

Private Services

Services can be defined as private, meaning they can only be used via dependency injection and cannot be retrieved from the container directly:

# services.yml
services:
  my_service:
    class: MyNamespace\MyService
    public: false
    
  my_consumer:
    class: MyNamespace\MyConsumer
    arguments:
        - "@my_service"

The following will throw a ServiceNotPublicException:

<?php
$container->get('my_service');

Whilst the following will work:

<?php
namespace MyNamespace;

class MyConsumer {
    public function __construct(MyService $myService) {
    }
}

Prior Art

Inspired by Symfony's DependencyInjection component.

License

Released under the MIT license