The document compares the directory structures and MVC implementation between CodeIgniter 3 and CodeIgniter 4. Some key differences include CodeIgniter 4 using namespaces for classes, updating the directory structure of application and system folders, and implementing an ORM for models to work with databases rather than using the query builder as in CodeIgniter 3. The index.php file is also updated to bootstrap the framework differently in CodeIgniter 4.
Software Design Patterns in Laravel by Phill SparksPhill Sparks
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Laravel makes use of quite a few well-established design patterns that promote reusable object-oriented code. Together, we will investigate the design patterns used in the core of Laravel 4 and discuss how they encourage reusable software.