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Sounds tempting? There’s just one minor catch to it: Authors can’t assume that the average WordPress user has PHP 5.3 up an running on their system.
So what about backwards compatibility?
There simply is none. Since namespaces are just being introudced, there is no such thing as a fallback for plugins. So authors can either declare their plugins suitable only for users with PHP 5.3 or higher, or write two plugins, to also satisfy all other users.
What is your opinion? Will you use namespaces when developing a new plugin?