title: PHP subtract 1 month from date formatted with date ('m-Y')
body: <p>I'm trying to subtract 1 month from a date.</p>
  
  <pre><code>$today = date('m-Y');
  </code></pre>
  
  <p>This gives: 08-2016</p>
  
  <p>How can I subtract a month to get <code>07-2016</code>?</p>