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PHP

Predefined Constants


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.
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.

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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