--- poormanscron.module.1.18.2.1	Sun Jan 14 12:34:37 2007
+++ poormanscron.module	Tue Aug 12 13:01:16 2008
@@ -46,6 +46,45 @@ function poormanscron_exit() {
     // we don't get a chance to restore them below.
     $saved_messages = drupal_set_message();
 
+    // We don't know whether this exit hook is being run after serving the page
+    // from Drupal's page cache or at the end of the request after a full
+    // Drupal bootstrap. However, we need to ensure that something equivalent
+    // to a full bootstrap has taken place since cron hooks can reasonably
+    // assume a full bootstrap has happened. But we can't simply request a
+    // full bootstrap since this will set an HTTP response header, causing a
+    // a PHP error if the current page request has just been served from
+    // Drupal's page cache. Therefore we need to simulate a full bootstrap.
+
+    // We can be sure that bootstrap phase DRUPAL_BOOTSTRAP_LATE_PAGE_CACHE has
+    // essentially been completed. Continue with DRUPAL_BOOTSTRAP_PATH.
+    drupal_bootstrap(DRUPAL_BOOTSTRAP_PATH);
+    // Now simulate the final bootstrap phase, but without setting the HTTP
+    // header or invoking init hooks. If a full bootstrap has already taken
+    // place, no harm should be done by attempting to do the following again.
+    require_once './includes/common.inc';
+    require_once './includes/theme.inc';
+    require_once './includes/pager.inc';
+    require_once './includes/menu.inc';
+    require_once './includes/tablesort.inc';
+    require_once './includes/file.inc';
+    require_once './includes/unicode.inc';
+    require_once './includes/image.inc';
+    require_once './includes/form.inc';
+    // Set the Drupal custom error handler.
+    set_error_handler('error_handler');
+    // Detect string handling method
+    unicode_check();
+    // Undo magic quotes
+    fix_gpc_magic();
+    // Load all enabled modules
+    module_load_all();    
+    // Check if the localization system has already been initialized.
+    if (!isset($GLOBALS['locale'])) {
+      // Initialize the localization system.  Depends on i18n.module being loaded already.
+      $locale = locale_initialize();
+    }
+    // End of simulated full bootstrap.
+
     // Invoke the cron hooks of all enabled modules.
     if (variable_get('poormanscron_log_progress', 0) == 1) {
       // Invoke the cron hooks of all enabled modules and log the progress.