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Yii3 - How to start

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Yii3 - How to start

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3.0

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[...]
First of all, learn what [PHP Standards Recommendations](https://en.wikipedia.org/wiki/PHP_Standard_Recommendation) by [Framework Interoperability Group (FIG)](https://www.php-fig.org/psr) are. It will help you understand why so many "weird" PSR imports are in the Yii3 code. In short: These interfaces help authors of different frameworks to write compatible classes so they can be reused in any other framework following these principles.

## Dependency injection + container
Check [this YouTube video](https://www.youtube.com/watch?v=TqMXzEK0nsA) for explanation

## construct() and invoke()
 
It may be confusing that some classes contain both methods if the reader does not have experiences with invoking. Just like me a few days ago. invoke()
 
The `__invoke()` is called when you call the **instance** as a method. Like this:

```php
[...]
```

Note that "property promotion" should be only used in `__construct()` just like the dependency injection.


## Hash annotations for class attributes
PHP 8 introduces annotations like this (not only for class attributes):
[...]
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Written by: rackycz rackycz
Last updated by: rackycz rackycz
Created on: Oct 8, 2025
Last updated: 2 months ago
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