array_multisort() function in PHP

array_multisort() function is used to sort multiple or multi-dimensional arrays. It returns a sorted array.

Syntax

array_multisort(arr1, sort_order, sort_type, arr2, arr3, arr4...)

Parameters

• arr1 − Array to be sorted

• sort_order − Sort order. The following are possible values

  • - SORT_ASC - Default. Sort in ascending order (A-Z)

  • - SORT_DESC - Sort in descending order (Z-A)

• sort_type − Sorting behavior. The following are possible values ​​

  • SORT_REGULAR - Default. Compare elements in the normal way (standard ASCII)

  • SORT_NUMERIC - Compare elements as numeric values ​​

  • SORT_STRING - Compare elements as strings

  • SORT_LOCALE_STRING - Compares elements as strings, based on the current locale (can be changed using setlocale())

  • SORT_NATURAL - Use "Natural sorting" compares elements as strings, similar to natsort()

  • SORT_FLAG_CASE - can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL for case-insensitivity String sorting.

• arr2 − Another array. Optional

• arr3 − Another array. Optional.

• arr4 − Another array. Optional.

Return value

array_multisort() function returns a sorted array.

Example

Demonstration

<?php
$a1 = array(12, 55, 3, 9, 99);
$a2 = array(44, 67, 22, 78, 46);
array_multisort($a1,$a2);
print_r($a1);
print_r($a2);
?>

Output

Array
(
[0] => 3
[1] => 9
[2] => 12
[3] => 55
[4] => 99
)
Array
(
[0] => 22
[1] => 78
[2] => 44
[3] => 67
[4] => 46
)

Example

Let us see another example of merging two arrays and sorting them in ascending order An example.

Online demonstration

<?php
$a1 = array(12, 55, 3, 9, 99);
$a2 = array(44, 67, 22, 78, 46);
$num = array_merge($a1,$a2);
array_multisort($num,SORT_ASC,SORT_NUMERIC);
print_r($num);
?>

Output

Array
(
[0] => 3
[1] => 9
[2] => 12
[3] => 22
[4] => 44
[5] => 46
[6] => 55
[7] => 67
[8] => 78
[9] => 99
)

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