title: How to Flatten a Multidimensional Array?
body: <p>Is it possible, in PHP, to flatten a (bi/multi)dimensional array without using recursion or references?</p>
  
  <p>I'm only interested in the values so the keys can be ignored, I'm thinking in the lines of <code>array_map()</code> and <code>array_values()</code>.</p>