Sorting Arrays

PHP offers several functions to sort arrays. This page describes the different functions and includes examples.

sort()

The sort() function sorts the values of an array in ascending alphabetical/numerical order (E.g. A, B, C, D, E... 1, 2, 3, 4, 5...)

<?php
$freecodecamp = array("free", "code", "camp");
sort($freecodecamp);
print_r($freecodecamp);
?>

Output:

Array
(
    [0] => camp
    [1] => code
    [2] => free
)

rsort()

The rsort() functions sort the values of an array in descending alphabetical/numerical order (E.g. Z, Y, X, W, V... 5, 4, 3, 2, 1...)

<?php
$freecodecamp = array("free", "code", "camp");
rsort($freecodecamp);
print_r($freecodecamp);
?>

Output:

Array
(
    [0] => free
    [1] => code
    [2] => camp
)

asort()

The asort() function sorts an associative array, by its values, in ascending alphabetical/numerical order (E.g. A, B, C, D, E... 1, 2, 3, 4, 5...)

<?php
$freecodecamp = array("zero"=>"free", "one"=>"code", "two"=>"camp");
asort($freecodecamp);
print_r($freecodecamp);
?>

Output:

Array
(
    [two] => camp
    [one] => code
    [zero] => free
)

ksort()

The ksort() function sorts an associative array, by its keys, in ascending alphabetical/numerical order (E.g. A, B, C, D, E... 1, 2, 3, 4, 5...)

<?php
$freecodecamp = array("zero"=>"free", "one"=>"code", "two"=>"camp");
ksort($freecodecamp);
print_r($freecodecamp);
?>

Output:

Array
(
    [one] => code
    [two] => camp
    [zero] => free
)

arsort()

The arsort() function sorts an associative array, by its values, in descending alphabetical/numerical order (E.g. Z, Y, X, W, V... 5, 4, 3, 2, 1...)

<?php
$freecodecamp = array("zero"=>"free", "one"=>"code", "two"=>"camp");
arsort($freecodecamp);
print_r($freecodecamp);
?>

Output:

Array
(
    [zero] => free
    [one] => code
    [two] => camp
)

krsort()

The krsort() function sorts an associative array, by its keys in descending alphabetical/numerical order (E.g. Z, Y, X, W, V... 5, 4, 3, 2, 1...)

<?php
$freecodecamp = array("zero"=>"free", "one"=>"code", "two"=>"camp");
krsort($freecodecamp);
print_r($freecodecamp);
?>

Output:

Array
(
    [zero] => free
    [two] => camp
    [one] => code
)