I followed the instructions @ Drupal: how to access to Drupal's APIs with a standalone php script? , however, my search query is returning 0 results (an empty array). I have confirmed that the same search term returns a result if executed from my drupal web page.
<?php
    chdir("drupal");
    define("DRUPAL_ROOT",".");
    require_once './includes/bootstrap.inc';
    include 'drupal/modules/search/search.api.php';
    drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
    $keys = array("harry","potter");
    $result = hook_search_execute($keys);
    print_r($result);
?>
Can anyone give me some pointers as to why this isn't working? Many thanks!