counter.reset_time tells "counter" to reset the
counter used by the basic interface. It may be any of the
COUNTER_RESET_* constants (see below).
counter.save_pathstring
Tells "counter" where to save data that has to persist between
invocations of PHP (i.e. any counter that has COUNTER_RESET_NEVER or
COUNTER_FLAG_SAVE). A file will be created at this path, which must be
readable and writable to whatever user PHP is running as.
counter.initial_valueinteger
Sets the initial value of the counter used by the basic interface
whenever it is reset.