PHP 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);
  ?>

Output Result:

 BMW
 Toyota
 Volvo

 

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);
  ?>

Output Result:

 2
 4
 6
 11
 22

 

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);
?>

Output Result:

Volvo
Toyota
BMW

 

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);
?>

Output Result:

22
11
6
4
2

 

Sort Array in 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);
?>

Output Result:

Key=Peter, Value=35
Key=Ben, Value=37
Key=Joe, Value=43

 

Sort Array in 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);
?>

Output Result:

Key=Ben, Value=37
Key=Joe, Value=43
Key=Peter, Value=35

 

Sort Array in 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);
?>

Output Result:

Key=Joe, Value=43
Key=Ben, Value=37
Key=Peter, Value=35

 

Sort Array in 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);
?>

Output Result:

Key=Peter, Value=35
Key=Joe, Value=43
Key=Ben, Value=37

 

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!

Next Chapter »

 

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