PHP Reference
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Quick Reference

The PHP array_multisort() function returns a sorted array from one or more arrays. String keys will be maintained, but numeric keys will be re-indexed, starting at 0.

<?php
$a1 = array('Lamborghini', 'Ferrari', 'Maserati');
$a2 = array('Ferrari', 'Maserati', 'Alfa Romeo');

array_multisort($a1, SORT_DESC, $a2, SORT_ASC);

print_r($a1);
print '<br>';
print_r($a2);
?>

Note

Arrays count starting from zero NOT one. So item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on.

Output

Array ( [0] => Maserati [1] => Lamborghini [2] => Ferrari )
Array ( [0] => Alfa Romeo [1] => Ferrari [2] => Maserati )

Syntax

array_multisort(array1, sortorder, sorttype, array2, array3, ...)

Parameters

ParameterDescription
array1Specifies an array (required)
sortorderSpecifies the sorting order:

  • SORT_ASC - Sort in ascending order (A-Z) (default)

  • SORT_DESC - Sort in descending order (Z-A)
sorttypeSpecifies the type to use, when comparing elements:

  • SORT_REGULAR - Compare elements normally (Standard ASCII) (default)

  • SORT_NUMERIC - Compare elements as numeric values

  • SORT_STRING - Compare elements as string values

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

  • SORT_NATURAL - Compare elements as strings using "natural ordering" like natsort()

  • SORT_FLAG_CASE - Can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort strings case-insensitively
array2Specifies an array
array3, ...Specifies additional arrays

PHP Notes:

  • When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
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