title: PHP date strtotime not working
body: <p>I wrote this piece of code</p>
  
  <pre><code>echo date("Y-m-d", strtotime($date, strtotime("+ " . $days . " days")));
  
  $date = 2012-04-12
  $days = 15
  </code></pre>
  
  <p>I am looking to add <code>$days</code> (15 days) to the date (<code>2012-04-12</code>) I am expecting to get <code>2012-04-27</code> and this code returns me <code>2012-04-12</code>, what am I doing wrong?</p>