title: Get the Monday and Sunday of a given week in php
body: <p>Given a week of the year (20 for example) </p>
  
  <p>How can I retrieve the Monday and Sunday days of this week?.</p>
  
  <p>What i need to show is a string with the day range of that week, something like</p>
  
  <pre><code> from dayX of monthX of 2012 to dayY of monthXY of 2012
  </code></pre>
  
  <p>Thanks</p>