# Error Handling and Logging

- Introduction
- Installing/Configuring
  - Requirements
  - Installation
  - Runtime Configuration
  - Resource Types
- Predefined Constants
- Examples
- Error Handling Functions
  - debug_backtrace — Generates a backtrace
  - debug_print_backtrace — Prints a backtrace
  - error_clear_last — Clear the most recent error
  - error_get_last — Get the last occurred error
  - error_log — Send an error message to the defined error handling routines
  - 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