If include() fails, it spits out a warning and keeps going. If require() fails, it spits out an error and dies.
include_once and require_once do the same thing, except each file can only be included once during execution to prevent recursive includes.
If include() fails, it spits
If include() fails, it spits out a warning and keeps going. If require() fails, it spits out an error and dies.
include_once and require_once do the same thing, except each file can only be included once during execution to prevent recursive includes.