array_multisort

Name:array_multisort

Category:Array

Programming Language:php

One-line Description:Sort multiple arrays or multi-dimensional arrays.

Definition and usage

array_multisort() function returns a sorted array. You can enter one or more arrays. The function sorts the first array first, followed by the other arrays, and if two or more values are the same, it sorts the next array.

Note: The string key name will be retained, but the numeric key name will be reindexed, starting at 0 and incrementing by 1.

Note: You can set the sort order and sort type parameters after each array. If not set, each array parameter uses the default value.

grammar

 array_multisort ( array1 , sorting order , sorting type , array2 , array3 ... )

parameter	describe
array1	Required. Specify array.
sorting order	Optional. Specify the order of arrangement. Possible values: SORT_ASC - Default. Order in ascending order (AZ). SORT_DESC - Order in descending order (ZA).
sorting type	Optional. Specify the sorting type. Possible values: SORT_REGULAR - Default. Arrange each item in a regular order (Standard ASCII, without changing the type). SORT_NUMERIC - Process each item as a number. SORT_STRING - Handle each item as a string. SORT_LOCALE_STRING - Handle each item as a string, based on the current locale setting (can be changed via setlocale()). SORT_NATURAL - Handle each item as a string, using a natural sort like natsort(). SORT_FLAG_CASE - Strings can be sorted in conjunction with (bit-by-bit or) SORT_STRING or SORT_NATURAL, and are case-insensitive.
array2	Optional. Specify array.
array3	Optional. Specify array.

illustrate

array_multisort() function sorts multiple arrays or multidimensional arrays.

The arrays in the parameters are treated as columns of a table and sorted by rows - this is similar to the functionality of the ORDER BY clause of SQL. The first array is the main array to be sorted. If the rows (values) in the array are compared to the same, they will be sorted according to the size of the corresponding value in the next input array, and so on.

The first parameter is an array, and each subsequent parameter may be an array, or one of the following sort order flags (the sort flag is used to change the default sort order):