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i have a project i took over. it is an app that has been build over many years with PHP and mysql.

It currently has a sort of good folder structure but the code itself is very poor written. There is php, sql statements and html code in almost every file. There is javascript code generated using php echo for not reason and so on.

I will like to use for further development either CakePHP or CodeIgniter, even if that means that for the new features some code will be written that already exists (eg.: maybe utility functions) in the old code.

is it possible to integrate one of these frameworks into an existing app? which one is easier? do you have any links on how to do it?

thanks.

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I have very little experience with CakePHP so my answer is going to be about CodeIgniter. I played with CakePHP for about a day and that was almost two years ago. In my opinion it will probably be easier to integrate with CodeIgniter although someone more experienced with CakePHP might prove me wrong.

Here is the approach I would take. I have never done this, but it seems like a logical way to approach the problem. I suppose this approach would also work with CakePHP.

  1. First, start with a fresh CodeIgniter install using the latest version.

  2. Next, create controllers and actions (controller methods) that mirror the current structure of the application. For example, if you had a page with the URL http://example.com/users/view you would create a Users controller with a view() method.

  3. Next, create view files for each of the current files of the application and load them via the appropriate controller methods. The goal here is to get the application working using CodeIgniter's routing system although at this point you won't be utilizing any models, libraries, or helpers.

  4. Once you have the application sitting on top of CodeIgniter, start refactoring it to fit into the MVC pattern. Pull out application logic (queries, form handling, etc...) from the view files and place them into the controllers. Keep all presentation logic and HTML in the views.

  5. Next, refactor the controllers. This is where it gets tricky because controller code can be placed into models, libraries, or other controller methods. A good starting point would be to take all of the queries and put them into appropriate models. Compare your controllers and see if there is any code duplication. That is a good sign that you should remove it from the controller and place it elsewhere. Unfortunately I can't really tell you where because it differs in each situation.

  6. Continue refactoring your application until you have it in a workable state that you are pleased with...

Hopefully this helps. I certainly missed some critical steps such as setting up and configuring CodeIgniter but if you're serious about doing this I would highly recommend reading through the CodeIgniter User Guide to get a good idea about how it works. You should also get familiar with MVC (model-view-controller) if you aren't already.

There's not really a one size fits all solution here but hopefully I've given you some ideas or at least a starting point to jump off of. If you have any questions or are a little confused drop a comment below and I'll get back to you.

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In my opinion, it's easier just to write your controllers in CodeIgniter (I've never used CakePHP) and models, than you just copy paste with some adjustments the views.

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thanks. but how do i integrate the old part (without the framework) and the new one (with framework). I guess i need to change the index.php of the framework.
Forget about the index.php and the rest. Just take your functions/classes and make new controllers in codeigniter, trying to use the old code, that will do what the old app did.
remember that your normal filesystem is in the root. Put codigniter in a directory in the root and build it the way it needs to be built create the site. Simply do not implement the index.php file(In the root) or links until you are ready. Once you are ready put your main controller in the routes, remove the entire Original filesystem and address your system in the codeigniter way

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