title: Is it necessary to learn nodejs before learning angularjs
body: <p>I am learning angularjs, but which ever the sample demo i download for better understand the angularjs, they have used nodejs too. 
  Ex: In this blog:
  <a href="http://blog.angularjs.org/2012/11/angularjs-example-applications.html" rel="nofollow">http://blog.angularjs.org/2012/11/angularjs-example-applications.html</a>
   All the examples, include nodejs as backend. </p>
  
  <ol>
  <li><p>Is it necessary to learn nodejs.</p></li>
  <li><p>The yeoman and other supporting tools like bower, grunt make use of nodejs.
  but i feel difficult to learn two sets of programming, as i know PHP to some extent.</p></li>
  <li><p>Can i use these yeoman, bower and grunt without nodejs and use php as my backend. If so, please provide the demo sample link having php as backend.</p></li>
  </ol>