Web Standards Programmer's Reference: HTML, CSS, JavaScript®, Perl, Python®, and PHP

F.2. Arrays

Function	Returns	Description
krsort(array array_arg [, int sort_flags])	bool	Sorts an array by key value in reverse order.
ksort(array array_arg [, int sort_flags])	bool	Sorts an array by key.
count(mixed var [, int mode])	int	Counts the number of elements in a variable (usually an array).
natsort(array array_arg)	void	Sorts an array using natural sort.
natcasesort(array array_arg)	void	Sorts an array using case-insensitive natural sort.
asort(array array_arg [, int sort_flags])	bool	Sorts an array and maintains index association.
arsort(array array_arg [, int sort_flags])	bool	Sorts an array in reverse order and maintains index association.
sort(array array_arg [, int sort_flags])	bool	Sorts an array.
rsort(array array_arg [, int sort_flags])	bool	Sorts an array in reverse order.
usort(array array_arg, string cmp_function)	bool	Sorts an array by values using a user-defined comparison function.
uasort(array array_arg, string cmp_function)	bool	Sorts an array with a user-defined comparison function and maintains index association.
uksort(array array_arg, string cmp_function)	bool	Sorts an array by keys using a user-defined comparison function.
end(array array_arg)	mixed	Advances array argument's internal pointer to the last element and returns it.
prev(array array_arg)	mixed	Moves array argument's internal pointer to the previous element and returns it.
next(array array_arg)	mixed	Moves array argument's internal pointer to the next element and returns it.
reset(array array_arg)	mixed ...