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Predefined Constants

The constants below are always available as part of the PHP core.

CASE_LOWER (integer): 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 (integer): CASE_UPPER is used with array_change_key_case() and is used to convert array keys to upper case.

Sorting order flags:

SORT_ASC (integer): SORT_ASC is used with array_multisort() to sort in ascending order.
SORT_DESC (integer): SORT_DESC is used with array_multisort() to sort in descending order.

Sorting type flags: used by various sort functions

SORT_REGULAR (integer): SORT_REGULAR is used to compare items normally.
SORT_NUMERIC (integer): SORT_NUMERIC is used to compare items numerically.
SORT_STRING (integer): SORT_STRING is used to compare items as strings.
SORT_LOCALE_STRING (integer): SORT_LOCALE_STRING is used to compare items as strings, based on the current locale. Added in PHP 4.4.0 and 5.0.2.

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