NULL as
an argument to reset the error handler.
NULL, set_error_handler() and
set_exception_handler() now return the previous error
or exception handler, respectively.
depth
parameter.
timezone argument, and
IntlCalendar objects for the
calendar argument. Furthermore, if the time zone
is omitted and the calendar doesn't specify a time
zone, PHP's default time zone from
date_default_timezone_get() is now used instead of the
default ICU time zone.