system_cron

• Drupal 6
• Drupal 7

Versions

6 – 7

system_cron()

Implements hook_cron().

Remove older rows from flood and batch table. Remove old temporary files.

Code

modules/system/system.module, line 2680

<?php
function system_cron() {
  // Cleanup the flood.
  db_delete('flood')
    ->condition('expiration', REQUEST_TIME, '<')
    ->execute();
  // Cleanup the batch table.
  db_delete('batch')
    ->condition('timestamp', REQUEST_TIME - 864000, '<')
    ->execute();

  // Remove temporary files that are older than DRUPAL_MAXIMUM_TEMP_FILE_AGE.
  // Use separate placeholders for the status to avoid a bug in some versions
  // of PHP. See http://drupal.org/node/352956
  $result = db_query('SELECT fid FROM {file} WHERE status & :permanent1 <> :permanent2 AND timestamp < :timestamp', array(
    ':permanent1' => FILE_STATUS_PERMANENT,
    ':permanent2' => FILE_STATUS_PERMANENT,
    ':timestamp' => REQUEST_TIME - DRUPAL_MAXIMUM_TEMP_FILE_AGE
  ));
  foreach ($result as $row) {
    if ($file = file_load($row->fid)) {
      if (!file_delete($file)) {
        watchdog('file system', 'Could not delete temporary file "%path" during garbage collection', array('%path' => $file->uri), WATCHDOG_ERROR);
      }
    }
  }

  $core = array('cache', 'cache_filter', 'cache_page', 'cache_form', 'cache_menu');
  $cache_tables = array_merge(module_invoke_all('flush_caches'), $core);
  foreach ($cache_tables as $table) {
    cache_clear_all(NULL, $table);
  }

  // Reset expired items in the default queue implementation table. If that's
  // not used, this will simply be a no-op.
  db_update('queue')
    ->fields(array(
      'expire' => 0,
    ))
    ->condition('expire', REQUEST_TIME, '<')
    ->execute();
}
?>

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