title: how to format an integer into the name of a weekday in php
body: <p>Is there a way to use <code>DateTime::CreateFromFormat</code> to convert a 0-6 integer into the name of a day of the week?  </p>
  
  <p>I am creating a calendar for a script and would like to let users customize the way the days of the week display (<em>Mon vs Monday</em>) so using an array of the week day names is not desirable.  </p>
  
  <p>How can I use <strong>CreateFromFormat</strong> to do this?</p>