What version to use for a Joomla project is a question that requires some thought, primarily regarding the functionality you want your Joomla site to have.
Joomla 1.0x has been around since about April 2004, with the latest version 1.015 released on 22nd February 2008, and because of this it has a large number of extensions available to quickly add functionality to your Joomla site. The time has allowed the extensions to mature so that most versions will work as expected and can be tweaked to your particular needs without much to worry about.
The other advantage is that more likely than not what you may want to do with a particular extension will probably have been done by someone else with their trials and tribulations of the process recorded on one of the numerous Joomla forums.
This saves a lot of time and effort when implementing your processes, the very reason you’re probably using a framework like Joomla in the first place!
Joomla 1.5 Stable (Khepri) was released on 22nd January 2008 after a number of months in beta testing, and so it is really only a few months ‘old’. Although many Joomla-extension developers have made their v1.0x version extensions available to use in v1.5, I’ve found them to be a hit or miss affair, never really knowing which extension will actually work as expected.
A current project I’m working on requires a lot of functionality, most of it already available using existing extensions, and some of it will require custom extensions. The decision was made to downgrade to Joomla 1.015 so we could utilise existing extensions and find enough guidance and help, primarily through the use of forums, when it came to developing the custom extensions. The idea is to wait for Joomla 1.5 to mature a little before we make the move to the new codebase.
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