I was just going through the interview of Lukas Kahwe Smith(Release manager php.net), He was explaining the key features we need to look out in PHP 5.3. In all the feature i am keen to use the feature lambda functions and closures and also PHAR.
About lambda function and closure i have already posted.
In this post lets look at PHAR, In the interview Lukas didn't explain in depth about it just mentioned PHAR is the result of a "proof of concept" PEAR package called "PHP_Archive".
I found an very good article on net about PHAR with an example.