PHP rsort()

The rsort() function sorts an indexed array in descending order. The sorting is done in place in lieu of returning a sorted copy.

Syntax

rsort(arrayToSort, sortType)

• arrayToSort: An array - required parameter, specifies the array to sort.
• sortType: A sort type - optional flag parameter, specifies how to compare the array elements.

Note: If two members compare as equal, they retain their original order. Prior to PHP 8.0.0, their relative order in the sorted array was undefined.

Sorting Flags

• SORT_REGULAR: Compare items normally.
• SORT_NUMERIC: Compare items numerically.
• SORT_STRING: Compare items as strings.
• SORT_LOCALE_STRING: Compare items as strings, based on the current locale option (setlocale()).
• SORT_NATURAL: Compare items as strings using “natural ordering” like natsort().
• SORT_FLAG_CASE: Sort strings case-insensitively with other flag options (SORT_STRING, SORT_NATURAL).

Example

In this example fruits is sorted in descending order.

<?php
$fruits = array("Grapes", "Mangos", "Cherries", "Kiwis");
rsort($fruits);
foreach ($fruits as $key => $val) {
    echo "$key = $val\n";
}
?>

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The output looks like this:

0 = Mangos
1 = Kiwis
2 = Grapes
3 = Cherries

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Codebyte Example

The following example sorts numbers with the SORT_STRING flag.

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