How to directly Upgrade from CodeIgniter 2.1.4 to 3.0 - codeigniter

I have an app built using the legacy 2.x (2.1.4 to be exact) version of CodeIgniter. Now I want to upgrade. How would I do that?
Or is it even possible and easy?

Upgrade first from 2.1.4 to 2.2.0 by replacing all files in the "system" folder and then use the tutorial on the official codeigniter site.
I haven't tried this but it seems logical.

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Upgrading laravel from 4.2 to 5.4

I have a large project running on Laravel 4.2 and now I would like to upgrade it to the latest release (5.4)
On the upgrading guide I can see the steps to upgrade from each release to the next one, but the 4.2 to 5.0 requires a fresh install. Hence the question: should I install 5.4 (and fix problems) or 5.0 (running each upgrade)?
I'm possibily using any Laravel functionality, and have organized repositories for my own custom methods; I also need to maintain the database. I need to upgrade because I would like to use event bradcasting with Laravel Echo.
Thanks
To those looking for an answer: update directly to latest version, then fix changes along the way.
Explanation:
At first I tried to upgrade version by version; it was a pain. Every single vendor had different packages for each version and that caused issues even before correcting the code. I couldn't start fixing my code because the installation requirements of the vendors were failing at a certain point of the upgrade process.
Upgrading directly to latest version requires the correction of many things, but at least those are only related to your code. In my case I had to remove Sentry (authentication), Laravel OAuth, and some others I don't remember in favor of some native packages which I hope will be maintained properly. The upside of this approach is that once you have all the packages you need installed you can work directly on your code... which is what you have to do anyway.

Which version of Magento is used for extension devlopement

I have planned to develop an extension in Magento e commerce domain.
which version of Magento should i go?.
If I develop the magento for version 2.0 , it should support for older version 1.x. or else 1.x extension supports 2.0.?
You should have to develop for both version with different - different modules
but the best way
you develop first for Magento 1.X version then according to that Convert that Module to 2.X version
because in web you can find more Posts related to Version 1.x and build better logic according to your requirement .

Migrating from PyroCMS 2.1.x to 2.2.x

Im developing a shopping cart system for PyroCMS, but moving my code to 2.2.1 is causing me a few headaches.
I cant find any links that describe the technical changes or how to migrate my existing code over to it.
Is there a public list of technical changes that I can use as a reference?
thanks in advance.
this is the change log, you can take a look at new changes
http://docs.pyrocms.com/2.2/manual/reference/changelog
Upgrade guide from 2.1.x to 2.2.0 (note step 8 for addons)
Upgrade from 2.2.0 to 2.2.1
Essentially 2.1 to 2.2 needs some care, 2.2.0 to 2.2.1 should be a straightforward backup and replace of the system directory if you're not using Git (if you do have the time/ability to learn/use Git, it's hugely beneficial for keeping track of changes).
…and of course always do PyroCMS upgrades on a dev server because it invariably breaks in a way you're not expecting.

how to downgrade from Rails 3.1.1 to Rails 3.0.3

I created an App in Rails 3.1.1 but now I want to downgrade it to Rails 3.0.3. Will replacing rails version in gemfile do given the new file structure of Rails 3.1.1.
No, you will have to get rid of asset pipeline (maybe something else). If you haven't gone far, it might be easier to just regenerate the app.
The major change is the assents folder. Transfer the data into public folder for 3.0

how to update mootools version in joomla 1.5

I don't know why joomla is not updating mootools with their updated version, joomla 1.5 still use mootools v 1.1, i tried to replace it with latest mootools version, but results are horrible, website stops working, everthing gone worst.
so please suggest me how to update mootools version into joomla without any problem.
Joomla 1.5.20 has plug-in for the Mootools 1.2.4 called "Mootools 1.2.4 Upgrade", but the plug-in is disabled by default.
If you are making a clean installation go "Admin->Tools->Plug-ins" find and enabled "Mootools 1.2.4 upgrade plugin".
If you are updating older Joomla system to 1.5.20, the plugin will be installed but it will not be visible because it will not have plug-in record in the database, therefore the plugin cannot be used. Here is a tutorial showing how to add this plugin when updating Joomla system from older version - http://www.boolcast.com/updates/mootools-124-upgrade-plugin-for-joomla-15.
Now that Mootools core 1.2.5 is out, i'd bet on it (hopefully) for J!1.6 RC.
And be aware that 1.5.20 mootools.js (in mtupdate plugin) contains More 1.2.4.2 (current version version is More 1.2.4.4).
Search the Joomla forums, there are several threads on updating Mootools.
In general, you can update the frontend pretty easily (assuming you don't want the built in Joomla functions or have components that rely on them). The backend is more problematic as it's built heavily around 1.1
Having said all of that, the latest versionof Joomla 1.5.20 has a plugin to allow you to update to 1.2. You could try updating?

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