title: What is "<Cycle 1>" an indication of in Xdebug?
body: <p>I have an xdebug profile on a php script that I parsed with kcachegrind. Here is a screenshot showing that the most time spent inside any given function was spent inside <code>&lt;cycle 1&gt;</code> and the top 'Callers' were made from 'include' and 'include_once' in index.php.</p>
  
  <p><img src="https://i.stack.imgur.com/PSguD.png" alt="kcachegrind of xdebug profile showing cycle 1"></p>
  
  <p>This profile was run during a stress-test using apache 'ab' so there were many concurrent connections occurring.</p>
  
  <p>What does <code>&lt;cycle 1&gt;</code> indicate on an xdebug profile?</p>