This function writes a debug message to the standard error. Depending on the settings of the AFC Base class, messages passed to the afc_debug function may be shown or simply ignored. See afc_set_tag() for more info. If this function is not enough flexible for you, than you should take a look at afc_debug_adv() counterpart.
Pointer to a valid afc instance.
The debug message level. Valid values are
This is a very important message that needs to be shown
This is a standard-importance message.
This is a very informative message.
The name of the class raising the error.
Message to show