My Whatever Debug Tracer (Wordpress Plugin)

<?php
/*
Plugin Name: My Whatever Debug Tracer
Description: In WP_DEBUG mode, find out what plugin or theme file is causing notices.
*/

////////////////////////////////////////////////////////
// You can upload this file as wp-content/mu-plugins/my-whatever-debug-tracer.php
// and it will automatically activate (see http://codex.wordpress.org/Must_Use_Plugins ),
// or put it in your theme's functions.php, or use it as a normal plugin.
////////////////////////////////////////////////////////


if (WP_DEBUG) {
  // Set WP_DEBUG true in wp-config.php, otherwise this plugin does nothing.

  // Note, WP_DEBUG can be set like this in wp-config.php, for testing a live site:
  //    define('WP_DEBUG', 'your ip number' === @$_SERVER['REMOTE_ADDR']);

  add_action( 'deprecated_argument_run', 'my_whatever_debug_backtrace' );
  add_action( 'doing_it_wrong_run', 'my_whatever_debug_backtrace' );
}


if (! function_exists('function my_whatever_debug_backtrace')) {
///////////////////////////////////////////////////////
function my_whatever_debug_backtrace($f) {

  // Another way to do it, suggested by
  // http://wordpress.org/support/topic/notice-wp_deregister_script-was-called-incorrectly
  // would be:
  //    throw new Exception("Testing");
  // (It will halt the script).

  // Just print the trace for the first offender, to make the output easier to read.
  if (defined('MY_WHATEVER_DEBUG_DONE')) return;
  define('MY_WHATEVER_DEBUG_DONE', true);

  printf("<pre>my_whatever_debug_backtrace($f)</pre>\n");
  $fvs= debug_backtrace();
  foreach ($fvs as $i=>$fv) {
    // Just print the first line, and the first line referencing wp-content
    $m= is_int(strpos((string)@$fv['file'], 'wp-content'));
    if ($i==0 || $m) {
        printf(
            "<pre>my_whatever_debug_backtrace(%s)[%d]=[%s]</pre>\n",
            $f,
            $i,
            htmlspecialchars(print_r($fv,1))
        );
        if ($m) break;
    }
  }
}
}

?>