title: What state of function arguments does debug_backtrace() capture?
body: <p>Some abstract code:</p>
  
  <pre><code>function test($a = 5) {
    debug_backtrace();
    a = 10;
  }
  </code></pre>
  
  <p>What will debug_trace tell us about arguments of the test function?<BR>
  Will it capture <code>$a</code> as 5 or 10?</p>