How to use Phalcon's dependency injection system?

@samara 

Phalcon's dependency injection system is a powerful tool for managing dependencies in your application. Here is a step-by-step guide on how to use it:

Step 1: Set up the DI container

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$di = new PhalconDiFactoryDefault();

Step 2: Register a service

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$di->set('serviceName', function() {
    return new MyNamespaceService();
});

Step 3: Retrieve the service

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$service = $di->get('serviceName');

Step 4: Use the service

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$service->doSomething();

You can also specify dependencies for each service by adding arguments to the closure:

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$di->set('serviceName', function($dependency) {
    return new MyNamespaceService($dependency);
});

$service = $di->get('serviceName', ['dependency']);

You can also chain dependencies by using the getShared method:

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$di->setShared('serviceA', function() {
    return new MyNamespaceServiceA();
});

$di->set('serviceB', function() use ($di) {
    $serviceA = $di->getShared('serviceA');
    return new MyNamespaceServiceB($serviceA);
});

$serviceB = $di->get('serviceB');

In this example, ServiceB depends on ServiceA, which is shared across the application, so it is retrieved using getShared.

By using the DI container, you can ensure that dependencies are managed consistently throughout your application, making it easier to maintain and test.