PHP 5 Sorting Arrays
The elements in an array can be sorted in alphabetical or numerical order, descending or ascending.
PHP - Sort Functions For Arrays
In this chapter, we will go through the following PHP array sort functions:
- 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
Sort Array in Ascending Order - sort()
The following example sorts the elements of the $cars array in ascending alphabetical order:
Example
<?php
$cars = array("Volvo", "BMW", "Toyota");
sort($cars);
?>
The following example sorts the elements of the $numbers array in ascending numerical order:
Example
<?php
$numbers = array(4, 6, 2, 22, 11);
sort($numbers);
?>
Sort Array in Descending Order - rsort()
The following example sorts the elements of the $cars array in descending alphabetical order:
Example
<?php
$cars = array("Volvo", "BMW", "Toyota");
rsort($cars);
?>
The following example sorts the elements of the $numbers array in descending numerical order:
Example
<?php
$numbers = array(4, 6, 2, 22, 11);
rsort($numbers);
?>
Sort Array (Ascending Order), According to Value - asort()
The following example sorts an associative array in ascending order, according to the value:
Example
<?php
$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
asort($age);
?>
Sort Array (Ascending Order), According to Key - ksort()
The following example sorts an associative array in ascending order, according to the key:
Example
<?php
$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
ksort($age);
?>
Sort Array (Descending Order), According to Value - arsort()
The following example sorts an associative array in descending order, according to the value:
Example
<?php
$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
arsort($age);
?>
Sort Array (Descending Order), According to Key - krsort()
The following example sorts an associative array in descending order, according to the key:
Example
<?php
$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
krsort($age);
?>
Complete PHP Array Reference
For a complete reference of all array functions, go to our complete PHP Array Reference.
The reference contains a brief description, and examples of use, for each function!