Check for Dead Drupal Modules

drupal_check_dead_mods.php

<?php
// Place script in root directory of Drupal installation.
// From https://www.drupal.org/node/1080330#comment-6520842
define('DRUPAL_ROOT', getcwd());
require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
function nobueno() {
    $startingtime = microtime(true);
    $o = '<p>Checking for dead modules ...</p>';
    $result = db_select('system')
      ->fields('system', array('filename'))
      ->condition('status', '1', '=')
      ->range(0, 150)
      ->execute();
      $n = 1;
      $m = 0;
    foreach ($result as $node) {
      $path = DRUPAL_ROOT.'/'.$node->filename;
      If (!file_exists($path)) {
          $o .= "#$n $path<br>";
          $m++;
      }
      $n++;
    }
    $timedif =  round(microtime(true) - $startingtime,3);
    $o .= "Total of $n active modules registered in database. $m dead entries found.<br>";
    $o .= 'Query Time: '.$timedif.' seconds';
    return $o;
}
echo nobueno();