function watchdog

7.x watchdog($type, $message, $variables = array(), $severity = WATCHDOG_NOTICE, $link = NULL)

Logs a system message.


$type: The category to which this message belongs. Can be any string, but the general practice is to use the name of the module calling watchdog().

$message: The message to store in the log. Keep $message translatable by not concatenating dynamic values into it! Variables in the message should be added by using placeholder strings alongside the variables argument to declare the value of the placeholders. See t() for documentation on how $message and $variables interact.

$variables: Array of variables to replace in the message on display or NULL if message is already translated or not possible to translate.

$severity: The severity of the message; one of the following values as defined in RFC 3164:

$link: A link to associate with the message.

See also



123 calls to watchdog()
actions_do in drupal/includes/
Performs a given list of actions by executing their callback functions.
actions_save in drupal/includes/
Saves an action and its user-supplied parameter values to the database.
actions_synchronize in drupal/includes/
Synchronizes actions that are provided by modules in hook_action_info().
aggregator_aggregator_fetch in drupal/modules/aggregator/
Implements hook_aggregator_fetch().
aggregator_form_category_submit in drupal/modules/aggregator/
Form submission handler for aggregator_form_category().

... See full list

18 string references to 'watchdog'
ActionLoopTestCase::testActionLoop in drupal/modules/simpletest/tests/actions.test
Set up a loop with 3 - 12 recursions, and see if it aborts properly.
actions_loop_test_trigger_info in drupal/modules/simpletest/tests/actions_loop_test.module
Implements hook_trigger_info().
actions_loop_test_watchdog in drupal/modules/simpletest/tests/actions_loop_test.module
Implements hook_watchdog().
bootstrap_hooks in drupal/includes/
Defines the critical hooks that force modules to always be loaded.
CommentActionsTestCase::clearWatchdog in drupal/modules/comment/comment.test
Helper function: clear the watchdog.

... See full list


drupal/includes/, line 1699
Functions that need to be loaded on every Drupal request.


function watchdog($type, $message, $variables = array(), $severity = WATCHDOG_NOTICE, $link = NULL) {
  global $user, $base_root;

  static $in_error_state = FALSE;

  // It is possible that the error handling will itself trigger an error. In that case, we could
  // end up in an infinite loop. To avoid that, we implement a simple static semaphore.
  if (!$in_error_state && function_exists('module_implements')) {
    $in_error_state = TRUE;

    // The user object may not exist in all conditions, so 0 is substituted if needed.
    $user_uid = isset($user->uid) ? $user->uid : 0;

    // Prepare the fields to be logged
    $log_entry = array(
      'type' => $type,
      'message' => $message,
      'variables' => $variables,
      'severity' => $severity,
      'link' => $link,
      'user' => $user,
      'uid' => $user_uid,
      'request_uri' => $base_root . request_uri(),
      'referer' => isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '',
      'ip' => ip_address(),
      // Request time isn't accurate for long processes, use time() instead.
      'timestamp' => time(),

    // Call the logging hooks to log/process the message
    foreach (module_implements('watchdog') as $module) {
      module_invoke($module, 'watchdog', $log_entry);

    // It is critical that the semaphore is only cleared here, in the parent
    // watchdog() call (not outside the loop), to prevent recursive execution.
    $in_error_state = FALSE;