Used to trigger a user error condition, it can be used by in conjunction with the built-in error handler, or with a user defined function that has been set as the new error handler (set_error_handler()).
This function is useful when you need to generate a particular response to an exception at runtime.
The designated error message for this error. It's limited to 1024 characters in length. Any additional characters beyond 1024 will be truncated.
The designated error type for this error. It only works with the E_USER family of constants, and will default to E_USER_NOTICE.
Example 1. trigger_error() example
See set_error_handler() for a more extensive example.