title: Tell How Function was called
body: <p>I've looked at debug_backtrace but so far it doesn't do what I need it to do.  </p>
  
  <p>I need to know whether the function I'm calling was 'called' or 'echo-ed'.  Like this:</p>
  
  <pre><code>function hello() {
      //blah blah
  }
  
  echo hello(); //echo-ed
  hello(); //'called'
  </code></pre>
  
  <p>But the function would do different things if it was 'called' over 'echo-ed'.</p>
  
  <p>How would I do that?</p>