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krsort — Sorts an array in descending order by key.


bool krsort(array[, flag]);
array array: Array to be sorted
int flag (optional): Flag specifying how to compare key values (PHP 4.0.0+ only)


TRUE on success; NULL on failure


This function sorts array in descending order by key. array is directly modified.

(PHP 4.0.0+ only) The way in which element values are compared can be modified by passing one of the following named constants as flag :

  • SORT_REGULAR: Compare element keys according to PHP's normal comparison rules. This is the default if flag is not given.

  • SORT_NUMERIC: Compare element keys according to their numeric values.

  • SORT_STRING: Compare element keys according to their string values.


PHP 3 since 3.0.13, PHP 4 since 4.0b4


Example 49. Sort an array in reverse order by key

$array = array(2 => 1, '3' => 2, 1 => 3, 4 => 4);

    [4] => 4
    [3] => 2
    [2] => 1
    [1] => 3

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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