Using ksort() to Sort Arrays by Key in PHP

The ksort() function sorts an array by its keys, maintaining the association between keys and values, and is primarily used for associative arrays in PHP.

Function signature: bool ksort(array &$array [, int $sort_flags = SORT_REGULAR])

Description: The function orders the array according to its keys. The optional $sort_flags parameter can modify the sorting behavior.

Parameters:

array : The input array to be sorted.

sort_flags : Optional flag to change sorting behavior (default SORT_REGULAR ).

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

Example:

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

Output:

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