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add solutions for chapter 9 and fix urltypos

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10
09-dependency-injector.md
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@ -16,7 +16,6 @@ we can later configure and switch our implementation.
We need a new 'Service\Time' namespace, so lets first create the folder in our 'src' directory 'src/Service/Time'.
There we place a Clock.php interface and a SystemClock.php implementation:
The Clock.php interface:
```php
<?php declare(strict_types=1);
@ -29,6 +28,9 @@ interface Clock
}
```
The Clock interface is modelled after the [proposed clock interface psr](https://github.com/php-fig/fig-standards/blob/master/proposed/clock.md)
which may or may not one day be accepted as an official standard.
The SystemClock.php implementation:
```php
<?php declare(strict_types=1);
@ -94,7 +96,7 @@ great blogpost about that topic, which I highly recommend.
Lets build our own Dependency Injector to make our application work again.
As a starting point we are going to take a look at the [Container Interface])(https://www.php-fig.org/psr/psr-11/) that
As a starting point we are going to take a look at the [Container Interface](https://www.php-fig.org/psr/psr-11/) that
is widely adopted in the PHP-World.
#### Building a dependency container
@ -103,7 +105,7 @@ is widely adopted in the PHP-World.
is needed for modern php development I will take a shortcut here and implement very reduced version to show you the
basic concept.*
The `Pst\Container\ContainerIterface` defines two methods:
The `Psr\Container\ContainerIterface` defines two methods:
* has($id): bool
returns true if the container can provide a value for a given ID
@ -209,7 +211,7 @@ when asking for the ResponseInterface and the Clock-Interface. We would need to
was smart enough to automatically figure our which services to Inject by looking at the constructor of a class.
PHP provides us with the great Reflection Api that is capable of showing us, [what arguments a constructor of any
given class requires](https://www.php.net/manual/de/reflectionclass.getconstructor.php]. We could implement that
given class requires](https://www.php.net/manual/de/reflectionclass.getconstructor.php). We could implement that
functionality ourselves, or just try to use a library that takes care of that for us.
You can query the composer database to find all [libraries that implement the container interface](https://packagist.org/providers/psr/container-implementation).