What is the use of ksort() in PHP?

ksort() sorts an array by its keys in ascending order (A to Z, 1 to 9). It keeps the key and value pairs together. To sort the keys in reverse order use krsort().

<?php
$age = ["Robin" => 25, "Anil" => 30, "Zoya" => 22];

ksort($age);
print_r($age);
?>

Output:

<?php
$age = ["Robin" => 25, "Anil" => 30, "Zoya" => 22];

krsort($age);
print_r($age);
?>

Output:

Both functions sort the original array (they do not return a new one). To sort by value use asort() and arsort().

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