Backtracer - simple debug backtrace without risk of recursion

backtracer.php

<?php

if ( ! function_exists( 'backtracer' ) ) {
  function backtracer( $die = true ) {
    $db = debug_backtrace();
    echo '<pre>';
    foreach ( $db as $record ) {
      echo "{$record['file']}:{$record['line']}\n";
    }
    echo '</pre>';
    if ( $die ) {
      die;
    }
  }
}
backtracer();