title: Symfony2 FlashBag, Yii setFlash
body: <p>I'm wondering why this does not have implementation in Symfony2 or Yii...</p>
  
  <p>My thought is: I want to place ALL errors in flash under one INDEX = 'errors' or 'success', so that i can just render them using <code>foreaches</code>.</p>
  
  <p>How flashes work now is:</p>
  
  <p>(yii example) <code>setFlash('error','error message')</code> this sets flash for one message and if i do this <code>setFlash('error','error message2')</code> this will REPLACE last message. What if I have more then one error message? It's dynamical - i can't know all the indexes.</p>
  
  <p>The same thing in Symfony2. I suspect this was done for a reason, but i don't know what it is. It seems to me it's far better to make indexes non-replacable, but deleteble.</p>