These functions allow you to interact with and
manipulate arrays in various ways. Arrays are essential
for storing, managing, and operating on sets of
variables.
Simple and multi-dimensional arrays are supported,
and may be either user created or created by another
function. There are specific database handling
functions for populating arrays from database queries,
and several functions return arrays.
Please see the Arrays section of the
manual for a detailed explanation of how arrays are
implemented and used in PHP.
以下經常有效常數為PHP核心的一部分。
CASE_LOWER
is used with array_change_key_case() and is
used to convert array keys to lower case. This is
also the default case for array_change_key_case().
CASE_UPPER
is used with array_change_key_case() and is
used to convert array keys to upper case.
Sorting order flags:
SORT_ASC is
used with array_multisort() to sort in
ascending order.
SORT_DESC
is used with array_multisort() to sort in
descending order.
Sorting type flags: used by various sort
functions
See also is_array(),
explode(), implode(),
split(), preg_split(), and
join().