title: What does PSR-0 stand for?
body: <p>I know what <strong>PSR-0</strong> is, and how, why, where to use it. </p>
  
  <p>I've googled for this and looked around stackoverflow related posts, but <strong>could not</strong> find anything. Even on its <a href="http://www.php-fig.org/psr/psr-0/" rel="noreferrer">official page</a> there's no such definition.</p>
  
  <p>So, the question is, <strong>what does PSR-0 exactly stand for</strong>?</p>