README

This is my simple dependency injection library in PHP

Features:

  - Can resolve class dependency that placed only on constructor (autowiring)
  - Binding concrete dependency into unresolved abstract, either closure or class name.
  - Can do shared binding concrete dependency into unresolved abstract, either closure or class name.
  - Can resolve concrete implementation on typehinted interface on constructor method.
  - Can resolve concrete implementation which bound on interface directly.
  - Registering service under an alias.

Setter injection and method injection not yet implemented. Feel free to look, or clone it for your own needs.

Autowiring:

Assume you have a class:

<?php

namespace Unused;

class Foo
{
	/**
	 * @var \SplPriorityQueue
	 */
	private $heap;

	public function __construct(\SplPriorityQueue $heap)
	{
		$this->heap = $heap;
	}	
}

And you have a class that depends on class Unused\Foo, however class Unused\Foo depends on class \SplPriorityQueue

<?php

namespace Unused;

class Bar
{
	/**
	 * @var Foo
	 */
	private $foo;

	public function __construct(Foo $foo)
	{
		$this->foo = $foo;
	}
}

You can resolve an instance of class Bar without resolving Bar and \SplPriorityQueue manually

<?php

use Unused\Bar;

$container = new Container();

$bar = $container->make(Bar::class);

Binding concrete dependency into unresolved abstract (only class name)

<?php

use Unused\Bar;
use Unused\Foo;

$container = new Container();

$container->bind(Bar::class, Foo::class);

$bar = $container->make(Bar::class);

Now, $bar is an instance of Bar::class.

Binding concrete dependency into unresolved abstract (with closure)

<?php

use Unused\Bar;
use Unused\Foo;

$container = new Container();

$container->bind(Bar::class, function($container) {
	return $container->make(Foo::class);
});

$bar = $container->make(Bar::class);

Now, $bar is an instance of Bar::class too.

Shared binding concrete dependency into unresolved abstract (only class name)

<?php

use Unused\Base;
use Unused\BaseInterface;

$container = new Container();

$container->singleton(BaseInterface::class, Base::class);

$base = $container->make(BaseInterface::class);

Shared binding concrete dependency into unresolved abstract (with closure)

<?php

use Unused\Base;
use Unused\BaseInterface;

$container = new Container();

$container->singleton(BaseInterface::class, function($container) {
	return $container->make(Base::class);
});

$base = $container->make(BaseInterface::class);

Binding typehinted interface into unresolved abstract (class based and with closure)

Assume you have an BaseInterface interface:

<?php

namespace Unused;

interface BaseInterface
{
	public function setFirstName($firstName);

	public function setMiddleName($middleName);

	public function setLastName($lastName);
}

And a class which implements BaseInterface interface under the same namespace:

<?php

namespace Unused;

class Base implements BaseInterface
{
	/**
	 * @var string
	 */
	private $firstName;

	/**
	 * @var string
	 */
	private $middleName;

	/**
	 * @var string
	 */
	private $lastName;

	public function setFirstName($firstName)
	{
		$this->firstName = $firstName;
	}

	public function setMiddleName($middleName)
	{
		$this->middleName = $middleName;
	}

	public function setLastName($lastName)
	{
		$this->lastName = $lastName;
	}
}

And a class which have typehinted interface in it's constructor

<?php

namespace Unused;

class Foo
{
	/**
	 * @var BaseInterface
	 */
	private $base;

	public function __construct(BaseInterface $base)
	{
		$this->base = $base;
	}
}

You can resolve class Foo with binding class Base into BaseInterface first.

<?php

use Unused\BaseInterface;
use Unused\Base;
use Unused\Foo;

$container = new Container();

$container->bind(BaseInterface::class, Base::class);

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

Or, you and bind concrete implementation of BaseInterface with closure

<?php

use Unused\BaseInterface;
use Unused\Base;
use Unused\Foo;

$container = new Container();

$container->bind(BaseInterface::class, function($container) {
	return $container->make(Base::class);
});

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

Resolve concrete implementation which bound on interface directly

Assume you have an interface:

<?php

namespace Unused;

interface BaseInterface
{
	public function setFirstName($firstName);

	public function setMiddleName($middleName);

	public function setLastName($lastName);
}

And, concrete class which implements Unused\BaseInterface

<?php

namespace Unused;

class Base implements BaseInterface
{
	/**
	 * @var string
	 */
	private $firstName;

	/**
	 * @var string
	 */
	private $middleName;

	/**
	 * @var string
	 */
	private $lastName;

	/**
	 * @implements
	 */
	public function setFirstName($firstName)
	{
		$this->firstName = $firstName;
	}

	/**
	 * @implements
	 */
	public function setMiddleName($middleName)
	{
		$this->middleName = $middleName;
	}

	/**
	 * @implements
	 */
	public function setLastName($lastName)
	{
		$this->lastName = $lastName;
	}
}

Bind concrete implementation on that interface first (use either direct class name or closure)

<?php

use Unused\Base;
use Unused\BaseInterface;

$container = new Container();

// with direct class name.
$container->bind(BaseInterface::class, Base::class);

// or, use a closure.
$container->bind(BaseInterface::class, function($container) {
	return $container->make(Base::class);
});

Then, get it directly.

$base = $container->make(BaseInterface::class);

Registering service under an alias (PSR-11 compatible.)

Assume you have a service which require a concrete implementation of a BaseInterface:

<?php

namespace Unused;

class FooService
{
	/**
	 * @var BaseInterface
	 */
	private $base;

	public function __construct(BaseInterface $base)
	{
		$this->base = $base;
	}
}

Just bind a concrete implementation of BaseInterface, then register FooService under an alias (e.g: foo.service)

<?php

$container = new Container();

$container->bind(BaseInterface::class, function($container) {
	return $container->make(Base::class);
});

$container->register('foo.service', FooService::class);

$service = $container->get('foo.service');

Unit Testing

If you want to run unit tests:

vendor/bin/phpunit

If you need more verbose:

vendor/bin/phpunit --verbose