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array_multisort() function in PHP
The array_multisort() function sorts 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 − The sort order. The following are the possible values
- SORT_ASC - Default. Sort in ascending order (A-Z)
- SORT_DESC - Sort in descending order (Z-A)
sort_type − The sort behavior. Following are the possible values
SORT_REGULAR - Default. Compare elements normally (Standard ASCII)
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.
arr2 − Another array. Optional
arr3 − Another array. Optional.
arr4 − Another array. Optional.
Return
The array_multisort() function returns a sorted array.
Example
<?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 to merge two array and sort them in ascending order.
<?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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