PHP - Sorting Arrays

In PHP, there are built-in functions which can be used to sort arrays. In this section, we will discuss PHP sort functions:

• sort(): Sort an indexed array in ascending order.
• rsort(): Sort an indexed array in descending order.
• asort(): Sort an associative array in ascending order, according to the value.
• arsort(): Sort an associative array in descending order, according to the value.
• ksort(): Sort an associative array in ascending order, according to the key.
• krsort(): Sort an associative array in descending order, according to the key.

Sort Array in Ascending Order - sort()

In the example below, sort() function is used to sort the indexed array MyArray in ascending order.

<?php
$MyArray = array("Marry", "John", "Kim", "Adam");
sort($MyArray);

print_r($MyArray);
?>

The output of the above code will be:

Array
(
    [0] => Adam
    [1] => John
    [2] => Kim
    [3] => Marry
)

Sort Array in Descending Order - rsort()

In the example below, rsort() function is used to sort the indexed array MyArray in descending order.

<?php
$MyArray = array("Marry", "John", "Kim", "Adam");
rsort($MyArray);

print_r($MyArray);
?>

The output of the above code will be:

Array
(
    [0] => Marry
    [1] => Kim
    [2] => John
    [3] => Adam
)

Sort Array in Ascending Order by Value - asort()

In the example below, asort() function is used to sort the associative array MyArray in ascending order, according to its value.

<?php
$MyArray = array("Marry"=>25, "John"=>30, "Kim"=>22, "Adam"=>35);
asort($MyArray);

print_r($MyArray);
?>

The output of the above code will be:

Array
(
    [Kim] => 22
    [Marry] => 25
    [John] => 30
    [Adam] => 35
)

Sort Array in Descending Order by Value - arsort()

In the example below, arsort() function is used to sort the associative array MyArray in descending order, according to its value.

<?php
$MyArray = array("Marry"=>25, "John"=>30, "Kim"=>22, "Adam"=>35);
arsort($MyArray);

print_r($MyArray);
?>

The output of the above code will be:

Array
(
    [Adam] => 35
    [John] => 30
    [Marry] => 25
    [Kim] => 22
)

Sort Array in Ascending Order by Key - ksort()

In the example below, ksort() function is used to sort the associative array MyArray in ascending order, according to its key.

<?php
$MyArray = array("Marry"=>25, "John"=>30, "Kim"=>22, "Adam"=>35);
ksort($MyArray);

print_r($MyArray);
?>

The output of the above code will be:

Array
(
    [Adam] => 35
    [John] => 30
    [Kim] => 22
    [Marry] => 25
)

Sort Array in Descending Order by Key - krsort()

In the example below, krsort() function is used to sort the associative array MyArray in descending order, according to its key.

<?php
$MyArray = array("Marry"=>25, "John"=>30, "Kim"=>22, "Adam"=>35);
krsort($MyArray);

print_r($MyArray);
?>

The output of the above code will be:

Array
(
    [Marry] => 25
    [Kim] => 22
    [John] => 30
    [Adam] => 35
)