title: how to get 4-days ago to now - php
body: <p>If current date is 2016-03-06, I would like to get these dates :</p>
  
  <pre><code>2016-03-06
  2016-03-05
  2016-03-04
  2016-03-03
  </code></pre>
  
  <p>I'm trying to get this purpose but my result not what I want :</p>
  
  <pre><code>$_4date = date("y-m-d",strtotime("day"));
  $_3date = date("y-m-d",strtotime("-1 day"));
  $_2date = date("y-m-d",strtotime("-2 day"));
  $_1date = date("y-m-d",strtotime("-3 day"));
  
  echo $_4date;
  echo '&lt;br /&gt;';
  echo $_3date;
  echo '&lt;br /&gt;';
  echo $_2date;
  echo '&lt;br /&gt;';
  echo $_1date;
  </code></pre>
  
  <p>the result is :</p>
  
  <pre><code>70-01-01
  16-03-05
  16-03-04
  16-03-03
  </code></pre>