(PHP 4, PHP 5, PHP 7, PHP 8)
arsort — Sort an array in descending order and maintain index association
Sorts array
in place in descending order, such that its keys maintain their correlation with the values they are associated with.
This is used mainly when sorting associative arrays where the actual element order is significant.
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.
Note:
Resets array's internal pointer to the first element.
array
The input array.
flags
The optional second parameter flags
may be used to modify the sorting behavior using these values:
Sorting type flags:
SORT_REGULAR
- compare items normally; the details are described in the comparison operators sectionSORT_NUMERIC
- compare items numericallySORT_STRING
- compare items as stringsSORT_LOCALE_STRING
- compare items as strings, based on the current locale. It uses the locale, which can be changed using setlocale()SORT_NATURAL
- compare items as strings using "natural ordering" like natsort()SORT_FLAG_CASE
- can be combined (bitwise OR) with SORT_STRING
or SORT_NATURAL
to sort strings case-insensitively Always returns true
.
Example #1 arsort() example
<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
arsort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val\n";
}
?>
The above example will output:
a = orange d = lemon b = banana c = apple
The fruits have been sorted in reverse alphabetical order, and the index associated with each element has been maintained.