Error Handling and Logging
- Introduction
 - Installing/Configuring
 - Predefined Constants
 - Examples
 - Error Handling Functions
- debug_backtrace — Generates a backtrace
 - debug_print_backtrace — Prints a backtrace
 - error_get_last — Get the last occurred error
 - error_log — Send an error message somewhere
 - error_reporting — Sets which PHP errors are reported
 - restore_error_handler — Restores the previous error handler function
 - restore_exception_handler — Restores the previously defined exception handler function
 - set_error_handler — Sets a user-defined error handler function
 - set_exception_handler — Sets a user-defined exception handler function
 - trigger_error — Generates a user-level error/warning/notice message
 - user_error — Alias of trigger_error