Predefined Constants

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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 5.0.2.
SORT_NATURAL (integer): SORT_NATURAL is used to compare items as strings using "natural ordering" like natsort(). Added in PHP 5.4.0.
SORT_FLAG_CASE (integer): SORT_FLAG_CASE can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort strings case-insensitively. Added in PHP 5.4.0.

Filter flags:

ARRAY_FILTER_USE_KEY (integer): ARRAY_FILTER_USE_KEY is used with array_filter() to pass each key as the first argument to the given callback function. Added in PHP 5.6.0.
ARRAY_FILTER_USE_BOTH (integer): ARRAY_FILTER_USE_BOTH is used with array_filter() to pass both value and key to the given callback function. Added in PHP 5.6.0.

COUNT_NORMAL (integer)
COUNT_RECURSIVE (integer)
EXTR_OVERWRITE (integer)
EXTR_SKIP (integer)
EXTR_PREFIX_SAME (integer)
EXTR_PREFIX_ALL (integer)
EXTR_PREFIX_INVALID (integer)
EXTR_PREFIX_IF_EXISTS (integer)
EXTR_IF_EXISTS (integer)
EXTR_REFS (integer)

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-array.constants.html

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References

Manuel PHP : http://php.net

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