title: What is the Difference between Floor and Round
body: <pre><code>         CODE                            RESULTS
  
  $a = floor(3.5);                         //3
  $b = round(3.5, 0, PHP_ROUND_HALF_DOWN); //3
  var_dump($a);                            //float(3)
  var_dump($b);                            //float(3)
  $c = gettype($a);                        //double
  $d = gettype($b);                        //double
  </code></pre>
  
  <p>What are the difference.?  when do I use floor() or round() for the number above.?</p>