(PHP 4, PHP 5, PHP 7, PHP 8)
arsort — Sort an array in reverse order and maintain index association
&$array
, int $flags
= SORT_REGULAR
) : boolThis function sorts an array such that array indices maintain their correlation with the array elements 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, their relative order in the sorted array is undefined.
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 section
SORT_NUMERIC
- compare items numerically
SORT_STRING
- compare items as strings
SORT_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
Returns true
on success or false
on failure.
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.