Using arsort() to Sort Arrays in Reverse Order While Preserving Index Association in PHP

The arsort() function in PHP sorts an array in reverse order while maintaining index association, which is essential when the order of elements matters.

Signature: bool arsort(array &$array, int $sort_flags = SORT_REGULAR)

Description: The function reorders the array based on its values in descending order, keeping the original keys linked to their corresponding values.

Parameters:

array – the input array to be sorted.

sort_flags – optional flag to modify sorting behavior (see sort() for details).

Return value: Returns TRUE on success or FALSE on failure.

Example:

<?php
$fruits = array(
    "d" => "lemon",
    "a" => "orange",
    "b" => "banana",
    "c" => "apple"
);
arsort($fruits);
foreach ($fruits as $key => $val) {
    echo "$key = $val\n";
}
?>

Output:

a = orange
d = lemon
b = banana
c = apple