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This documents track potential backward compatibility issues for Joomla 2.5 and Joomla Platform 11.4 which is included in Joomla 2.5. Listed are issues which potentially break extensions and newly deprecated APIs.
Please help making this document complete.
The base of this comparison is Joomla 1.7/Platform 11.2.
Backwards compatibility issues were also tracked for Joomla 1.7: Potential backward compatibility issues in Joomla 1.7 and Joomla Platform 11.1
The Associative array of user groups for a user no longer contains the group name, but only the group id in both the key and value. The names of groups for a user can be obtained from getGroupsByUser in JAccess.
(as of 1.7.3) The xml extension manifest for plugins on update servers must specify the client <client>0</client> in the <update> sections. Example:
<type>plugin</type> <folder>content</folder> <client>0</client>