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:
| Functions | Description |
|---|---|
| sort() | Sorts an array in ascending order. |
| rsort() | Sorts an array in descending order. |
| asort() | Sorts an array in ascending order, according to the value and maintaining key-value association. Mainly used for sorting associative arrays where the actual element order is significant. |
| arsort() | Sorts an array in descending order, according to the value and maintaining key-value association. Mainly used for sorting associative arrays where the actual element order is significant. |
| ksort() | Sorts an array in ascending order, according to the key and maintaining key-value association. Mainly used for sorting associative arrays where the actual element order is significant. |
| krsort() | Sorts an array in descending order, according to the key and maintaining key-value association. Mainly used for sorting associative arrays where the actual element order is significant. |
Sort Array in Ascending Order - sort()
In the example below, sort() function is used to sort the given indexed array in ascending order.
<?php
$MyArray = array("Marry", "John", "Kim", "Adam");
//using sort() function to sort
//the array in ascending order
sort($MyArray);
//displaying the result
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()
Consider the example below where rsort() function is used to sort the given indexed array in descending order.
<?php
$MyArray = array("Marry", "John", "Kim", "Adam");
//using rsort() function to sort
//the array in descending order
rsort($MyArray);
//displaying the result
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 given associative array in ascending order, according to its value.
<?php
$MyArray = array("Marry"=>25,
"John"=>30,
"Kim"=>22,
"Adam"=>35);
//using asort() function to sort the
//array in ascending order by value
asort($MyArray);
//displaying the result
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()
Consider the example below where arsort() function is used to sort the given associative array in descending order, according to its value.
<?php
$MyArray = array("Marry"=>25,
"John"=>30,
"Kim"=>22,
"Adam"=>35);
//using arsort() function to sort the
//array in descending order by value
arsort($MyArray);
//displaying the result
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 given associative array in ascending order, according to its key.
<?php
$MyArray = array("Marry"=>25,
"John"=>30,
"Kim"=>22,
"Adam"=>35);
//using ksort() function to sort the
//array in ascending order by key
ksort($MyArray);
//displaying the result
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()
Consider the example below where krsort() function is used to sort the given associative array in descending order, according to its key.
<?php
$MyArray = array("Marry"=>25,
"John"=>30,
"Kim"=>22,
"Adam"=>35);
//using krsort() function to sort the
//array in descending order by key
krsort($MyArray);
//displaying the result
print_r($MyArray);
?>
The output of the above code will be:
Array
(
[Marry] => 25
[Kim] => 22
[John] => 30
[Adam] => 35
)
