How to implement two-dimensional array sorting in php

In PHP, you can use the array_multisort() function to implement two-dimensional array sorting. This function can sort multiple arrays or multi-dimensional arrays, the syntax is "array_multisort (two-dimensional array, sort order, sort type)"; when the second parameter is omitted or set to "SORT_ASC", it will be sorted in ascending order and set to "SORT_DESC" Then sort in descending order.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In php, you can use array_multisort () function implements two-dimensional array sorting.

<?php  
header("content-type:text/html;charset=utf-8");
$arr = array(5,3,array(2,4),1,array(3,6,1,0),-1); 
echo "原二维数组：";
var_dump($arr);

echo "排序后的二维数组：";
array_multisort($arr);
var_dump($arr);
?>

This function sorts the outer elements first, and then sorts the inner subarray.

Description:

php built-in function array_multisort() is used to sort multiple arrays or multi-dimensional arrays. (Modify the original array)

You can enter one or more arrays. The function sorts the first array first, then the other arrays, and if two or more values ​​are the same, it sorts the next array.

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

Parameters	Description
array1	Required . Specifies an array.
sorting order	Optional. Specify the order of sorting. Possible values: SORT_ASC - Default. Sort in ascending order (A-Z). SORT_DESC - Sort in descending order (Z-A).
sorting type	Optional. Specifies the sorting type. Possible values: SORT_REGULAR - Default. Put each item in regular order (Standard ASCII, don't change the type). SORT_NUMERIC - Treat each item as a number. SORT_STRING - Treat each item as a string. SORT_LOCALE_STRING - Treat each item as a string, based on the current locale (can be changed via setlocale()). SORT_NATURAL - Treat each item as a string, using natural sorting like natsort(). SORT_FLAG_CASE - Can be combined (bitwise ORed) with SORT_STRING or SORT_NATURAL to sort strings, case-insensitively.
array2	Optional. Specifies an array.
array3	Optional. Specifies an array.

#Note: String key names will be preserved, but numeric key names will be re-indexed, starting at 0 and increasing by 1.

Return value: TRUE if successful, FALSE if failed.

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