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Php sorting arrays

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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); 
?>
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