On every new PHP 5.3 release there's the following line: "All users of PHP are encouraged to upgrade to this release." In other words, that means Ubuntu users, PHP 5.2 users and everyone else.
I personally don't know about any issues concerning PHP 5.3, but some of the features that are really important in PHP 5.3 are:
- namespaces
- late static binding
- __callStatic support
There's already some projects relying on features solely available in PHP 5.3, so I don't think upgrading to PHP 5.3 is optional.
On every new PHP 5.3 release there's the following line: "All users of PHP are encouraged to upgrade to this release." In other words, that means Ubuntu users, PHP 5.2 users and everyone else.
I personally don't know about any issues concerning PHP 5.3, but some of the features that are really important in PHP 5.3 are:
- namespaces
- late static binding
- __callStatic support
There's already some projects relying on features solely available in PHP 5.3, so I don't think upgrading to PHP 5.3 is optional.