print_backtrace.php

<?php
function print_backtrace() {
  $x = debug_backtrace();
  for ($i = 0, $l = count($x); $i < $l; $i++) {
    echo $x[$i]['file'], ':', $x[$i]['line'], "\n";
    echo ($l - $i), ': ', $x[$i]['function'], '(';
    foreach ($x[$i] ['args'] as $j => $arg) {
      echo ($j > 0 ? ', ' : ''),
        is_scalar($arg) ? $arg :
        ((is_array($arg) || is_object($arg)) ? json_encode($arg) :
          gettype($arg));
    }
    echo ")\n";
  }
}