Example use of Zend\ServiceManager 3

zend-service-manager-3-example.php

<?php
require('vendor/autoload.php');

use Zend\ServiceManager\Factory\InvokableFactory;

//--------------------------------------------------------
// classes that we are interested in
class Letter {
    public function __construct($paper, $envelope) {
        $this->paper = $paper;
        $this->envelope = $envelope;
    }
    public function write($text, $who, $address) {
        // do clever stuff
        $price = $this->envelope->stampPrice;
        echo "I have written a letter! The stamp cost $price!!!!\n";
    }
}

class Paper {}

class Envelope {
    public function __construct() {
        $this->stampPrice = '50p';
    }
    public function setPriceOfStamp($price) {
        $this->stampPrice = $price;
    }
}

//--------------------------------------------------------
// DIC related classes
class LetterFactory {
    public function __invoke($container) {
        echo "In the LetterFactory\n";
        $paper = $container->get('Paper');
        $envelope = $container->get(Envelope::class);
        return new Letter($paper, $envelope);
    }
}

class EnvelopeFactory {
    public function __invoke($container) {
        echo "In the EnvelopeFactory\n";
        return new Envelope();
    }
}

class FirstPriceStampEnvelopDelegatorFactory {
    public function __invoke($container, $name, $callback, $options = []) {
        echo "In the Delegator. name = $name\n";
        $envelope = $callback();
        $envelope->setPriceOfStamp('75p');
        return $envelope;
    }
}

//--------------------------------------------------------
// DIC configuration
$config = [
    'factories' => [
        Letter::class => LetterFactory::class,
        Paper::class => InvokableFactory::class,
        Envelope::class => EnvelopeFactory::class,
    ],
    'delegators' => [
        Envelope::class => [
            FirstPriceStampEnvelopDelegatorFactory::class,
        ],
    ],
];

$container = new Zend\ServiceManager\ServiceManager($config);
$letter = $container->get(Letter::class);
$letter->write("Hi", 'Ben', 'Home');