PHP 8 reference · Array Sorting Functions

PHP rsort() Function

Sort an array's values in descending order, in place. Keys are discarded and the result is renumbered from 0.

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Syntax

rsort(array &$array, int $flags = SORT_REGULAR): true

Parameter	Description
`array`	The array to sort (changed in place).
`flags` optional	`SORT_REGULAR`, `SORT_NUMERIC`, `SORT_STRING`, `SORT_NATURAL`, optionally `\| SORT_FLAG_CASE`. Default: `SORT_REGULAR`

Always true.

Highest firstTry it yourself

<?php
$scores = [72, 95, 88];
rsort($scores);
echo implode(", ", $scores), "\n";

Output

95, 88, 72

Natural order, descendingTry it yourself

<?php
$versions = ["1.10", "1.9", "1.2"];
rsort($versions, SORT_NATURAL);
echo implode(", ", $versions), "\n";

Output

1.10, 1.9, 1.2

Version	Change
PHP 4.0	Added
PHP 8.0	Sorting is stable: elements that compare equal keep their original order.
PHP 8.2	The return type is `true` (it was `bool`).

sort() · Sort an array's values in ascending order, in place. Keys are discarded and the result is renumbered from 0.
arsort() · Sort an array by value in descending order, keeping each key attached to its value. Great for leaderboards.
krsort() · Sort an array by key in descending order, keeping each value with its key.
array_reverse() · Return a new array with the elements in reverse order. String keys are kept; numeric keys are renumbered by default.
PHP Arrays · tutorial
PHP Array Functions · tutorial