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rsort — Sorts an array in descending order by element value.


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


TRUE on success; FALSE on failure


Sorts array in descending order by element value. String indexes are ignored and the resulting array is indexed numerically. Use arsort() if you're working with an associative array. The key values for the resulting indexed array are reordered after the sort is completed.

array is modified directly by this function.

(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 values according to PHP's normal comparison rules. This is the default if flag is not given.

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

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


PHP 3, PHP 4


Example 57. Sort an array in descending order by element value

$array = array('b' => 2, 'd' => 4, 'a' => 1, 'c' => 3);

Output (note that string indexes have been lost):
    [0] => 4
    [1] => 3
    [2] => 2
    [3] => 1

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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