- _drupal_exception_handler in includes/
bootstrap.inc - Provides custom PHP exception handling.
- _drupal_log_error in includes/
errors.inc - Logs a PHP error or exception and displays an error page in fatal cases.
- _drupal_session_write in includes/
session.inc - Writes an entire session to the database (internal use only).
- _drupal_shutdown_function in includes/
bootstrap.inc - Executes registered shutdown functions.