I know what PSR-0 is , and how, why, where to use it.
I searched this for a search and looked at the stackoverflow-related posts, but couldn't find anything. Even on the official page
PSR stands for the standard PHP recommendation, as described at http://www.php-fig.org/faqs/#what-does-psr-stand-for , and here http://www.php-fig.org/psr/ p>
PSR is a specification for defining a coding standard for PHP. There are currently six accepted recommendations:
each of which addresses a particular aspect of coding.
PSR, a request for the PHP specification, is an attempt to standardize the way people use PHP in the hope that different sets of code libraries will work together. http://petermoulding.com/php/psr
PSR stands for Suggesting Standards. I'm not sure if it is used anywhere else, but in the current context it is part of PHP-FIG (the PHP Framework interaction group).
For further links http://blog.jayawi.com/psr-0/