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.
Parameters
error_msg
The designated error message for this error. It's limited to 1024 characters in length. Any additional characters beyond 1024 will be truncated.
error_type
The designated error type for this error. It only works with the E_USER family of constants, and will default to E_USER_NOTICE.
Return Values
This function returns FALSE if wrong error_type is specified, TRUE otherwise.