PHP has a variety of built-in functions for sorting array elements in various ways, such as alphabetically or numerically in ascending or decreasing order. The most commonly used PHP array sort functions are:
-
sort()- sort arrays in ascending order -
rsort()- sort arrays in descending order -
asort()- sort associative arrays in ascending order, according to the value -
ksort()- sort associative arrays in ascending order, according to the key -
arsort()- sort associative arrays in descending order, according to the value -
krsort()- sort associative arrays in descending order, according to the key
The sort() function
The following example sorts the elements of the arrays in ascending order:
<?php
$countries = array("USA", "Germany", "UK", "Australia");
sort($countries);
print_r($countries);
$myNum = array(141, 26, 324, 142, 251);
sort($myNum);
print_r($myNum);
The rsort() function
The following example sorts the elements of the $cars array in descending order:
<?php
$countries = array("USA", "Germany", "UK", "Australia");
rsort($countries);
print_r($countries);
$myNum = array(141, 26, 324, 142, 251);
rsort($myNum);
print_r($myNum);
The asort() function
The asort() function sorts the elements of an associative array in ascending order according to the value. The following example sorts an associative array in ascending order, according to value.
<?php
$ages = array("Mark" => "35", "Jeff" => "37", "Ivan" => "43");
asort($ages);
print_r($ages);
The arsort() function
The arsort() function sorts the elements of an associative array in descending order according to the value. The following example sorts an associative array in descending order, according to value.
<?php
$ages = array("Mark" => "35", "Jeff" => "37", "Ivan" => "43");
arsort($ages);
print_r($ages);
The ksort() function
The ksort() function sorts the elements of an associative array in ascending order according to key. The following example sorts an associative array in ascending order, according to key.
<?php
$ages = array("Mark" => "35", "Jeff" => "37", "Ivan" => "43");
ksort($ages);
print_r($ages);
The krsort() function
The krsort() function sorts the elements of an associative array in descending order according to key. The following example sorts an associative array in descending order, according to key.
<?php
$ages = array("Mark" => "35", "Jeff" => "37", "Ivan" => "43");
krsort($ages);
print_r($ages);
Exercise
Create an array named $cars with the following values: ("Volvo", "Volkswagen", "Toyota", "Ford"). Sort the array in ascending order and print the values using the foreach loop.
<?php
$var = 123;
<?php
$cars = array("Volvo", "Volkswagen", "Toyota", "Ford");
sort($cars);
foreach ($cars as $value) {
echo "$value <br>";
};
{
"test_output_contains":
[
{
"expected":"Ford",
"error_message":"Sorry. Please try again."
},
{
"expected":"Toyota",
"error_message":"Sorry. Please try again."
},
{
"expected":"Volkswagen",
"error_message":"Sorry. Please try again."
},
{
"expected":"Volvo",
"error_message":"Sorry. Please try again."
}
],
"test_variable_exists":
{
"object":"$cars",
"error_message":"Have you declared <code>$cars<\/code>?"
},
"success_message":"Good job!",
"error_message":"Please read the instructions again."}