<slide title="Problem Solving Exercise">
<break />
<example title="Start Simple" result="1"><![CDATA[<?php
  $cnt_file = '/tmp/'.basename(__FILE__).'.cnt';;
  $num = (int)@file_get_contents($cnt_file);
  $num++;
  file_put_contents($cnt_file, $num); 
  echo "File has been accessed $num times";
?>]]></example>
</slide>
