Tutorial-First-Application VS Composer

b) Separate out all SQL and PHP database code. Put these in separate classes similar to this example Slim First Application Mapper class. You can decide later if you want to use a framework's DB code or not - it would be simply refactoring your existing code and not changing (hopefully) the API that you started using internally

Yes, as an example, the First Application's business logic (not that it's much) doesn't tie itself to the framework, as one example. Odan's Slim Skeleton, ADR Example (yes, I know you are the author), and the Aura Payload example class can be seen as other examples.

Both. Build business logic with PHP, then use a framework for the common functionality (routing, auth, validation, etc). Look at Slim's First Application to show a very simple example of this - https://github.com/slimphp/Tutorial-First-Application

Another option, to me and speaking to the OP as an alternative, it is simpler to add some Data Mappers/Repositories to abstract away the Database code. Good examples is the sample ADR application, Payload library example, Slim 3 First Application, or this Slim 4 Skeleton application

Yes, you can. Did you look at the example I provided? Want another one? Slim Framework's first application does exactly this:

https://github.com/slimphp/Tutorial-First-Application <- Uses the Slim framework

Delving into PHP frameworks like Laravel or Symfony is like building a skyscraper, with Composer acting as your "construction foreman," guiding you step by step to ensure your code is robust and awe-inspiring. This stage involves getting familiar with popular PHP frameworks such as Laravel, Symfony, CodeIgniter, etc., and utilizing the functionalities provided by these frameworks to rapidly develop efficient, maintainable web applications. Tools to consider: Laravel, Composer.

In our example application we will manage dependencies via Composer.

Our project template is equipped with Composer and an autoload class pre-installed. This inclusion in the repository streamlines the setup process, particularly for this access-token course. Composer, a dependency manager for PHP, simplifies the integration of external libraries and ensures efficient autoloading of classes. It plays a pivotal role in managing project dependencies, enabling developers to focus more on implementation rather than manual library management. If you're unfamiliar with Composer or need guidance on its installation, refer to the following link for detailed instructions: [https://getcomposer.org/] and this article for more details on the setup of the packages in this project.

On you Jenkins server, install PHP, its dependencies and Composer tool (Feel free to do this manually at first, then update your Ansible accordingly later)

Composer

Composer for installing the PHP package: https://getcomposer.org/

Visit https://getcomposer.org/ and click on the DOWNLOAD button.

Composer bisect command #11119

Composer is a PHP package manager and it will allow us to use many out-of-the-box packages and features such as HTTP requests, logging, and templates and database management. I use it to develop large, complex applications.