PHP Array Constants

CASE_LOWER
CASE_UPPER
SORT_ASC
SORT_DESC
SORT_REGULAR
SORT_NUMERIC
SORT_STRING
SORT_LOCALE_STRING
COUNT_NORMAL
COUNT_RECURSIVE
EXTR_OVERWRITE
EXTR_SKIP
EXTR_PREFIX_SAME
EXTR_PREFIX_ALL
EXTR_PREFIX_INVALID
EXTR_PREFIX_IF_EXISTS
EXTR_IF_EXISTS
EXTR_REFS