Example 1. debug_print_backtrace() example
<?php // include.php file
  function a() {     b(); }
  function b() {     c(); }
  function c(){     debug_print_backtrace(); }
  a();
  ?>
 
  <?php // test.php file // this is the file you should run
  include 'include.php'; ?>
 | 
The above example will output 
something similar to:
#0  eval() called at [/tmp/include.php:5]
#1  a() called at [/tmp/include.php:17]
#2  include(/tmp/include.php) called at [/tmp/test.php:3]
#0  c() called at [/tmp/include.php:10]
#1  b() called at [/tmp/include.php:6]
#2  a() called at [/tmp/include.php:17]
#3  include(/tmp/include.php) called at [/tmp/test.php:3]  |