Which version of Magento is used for extension devlopement - magento

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 .

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How to directly Upgrade from CodeIgniter 2.1.4 to 3.0

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.

Use of org.apache.httpcomponents in Websphere 8.x

maybe has someone the same problem.
We want use in our Application org.apache.httpcomponents in IBM WebSphere 8.x in Version 4.2.x ( org.apache.httpcore 4.2.4 and org.apache.httpclient 4.2.5 ). If we do that, we get an error java.lang.VerifyError. The reason is: IBM uses apache.httpcomponents in old version 4.0.1 even in Websphere. But We want the old version not use ( Version 4.0.1 was 2009 releases ) . IBM knows that problem and recommends the use of shared library. That works, when you use Rational products for developing. We use eclipse with WTP for developing with websphere. Unfortunately you can't define shared library with WTP.
Has anybody an idea, or other solution for this problem.
Have you tried doing your development against the WAS liberty profile? it would be an overall better experience and be an alternative to the shared library approach at development time.

Updating from Joomla 1.5.20 to most secure release

I'm updating a Joomla page for a friend of mine - and the version currently online (when it's not being brought down by hackers) is 1.5.20. As far as I can see, there are no update patches available to bring this up to date. I'm aware that I can't update this to a 2.x or a 3.x version, but if I at least could bring this up to the newest version of the 1.5.x releases, that'd be good for security.
So, what patch should I choose, and where can I find it?
From the Joomla docs;
If you are on the version prior to the current one, use the file that updates from the prior version to the current version (for example, Joomla_1.5.25_to_1.5.26-Stable-Patch_Package).
If you are on an older version, use the 1.5.0 to current version file (for example, Joomla_1.5.0_to_1.5.26-Stable-Patch_Package).
In your case, since you currently have 1.5.20 and 1.5.26 is the latest 1.5.x version released, the latter would be the correct choice.
Further update instructions are at the above linked docs, read them first, esp. when it comes to backing up the existing site.
There is no patch to upgrade from any Joomla 1.5 version to the current release.
The current Long Term Release (LTR) is Joomla 2.5, the lastest Short Term Release (STR) is Joomla 3.0.
Both of these are not directly upgradeable from any 1.5 version.
Your best bet would be to migrate using a tool such as:
http://extensions.joomla.org/extensions/migration-a-conversion/joomla-migration/15609
Please note that Joomla 1.5 is now unsupported, with no security patches issued to fix any vulnerabilities. Your Joomla 1.5 install will be getting unsecure, very quickly.
As Joachim said, backup first, restore at your leisure.

What is the difference in versions of Joomla CMS i.e. Joomla 1.7 and joomla 2.5?

Please explain the difference.I know one difference is user management but what is also.
What is the difference in versions of Joomla CMS i.e. Joomla 1.7 and joomla 2.5 ?
The biggest diffrence between joomla 1.5 and joomla 1.6 is user management .
In joomla 1.5 version are already default 5-6 user management.
But in joomla 1.6 version you create own user managment.
One important consideration and difference is that version 1.7 reached end-of-life status on February 24, with version 1.7.5 being final release of that line. What that means is there will be no further enhancements or bug fixes performed by the core Joomla team on version 1.7 going forward.
The official guidance from the Joomla development team is that 1.7.5 should only be used by those "who for some reason are unable to update to version 2.5.1." The release blurb for 1.7.5 (found here) contains the guidance and EOL date mention.
As far as pure feature differences are concerned, the page dedicated to detailing the new features in Joomla 2.5 does a better job than I could discussing them. You may also want to take a look at the release notes for version 2.5.3 here, as this is the latest release at the time of this answer.
Hope that helps.
The bigger the number, the more recent the release.
If developing a new website, you should use the most recent release of Joomla, which is Joomla 2.5.
Joomla 2.5 is just as painful to use, but more stable than, Joomla 1.7

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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