How to find the union of arrays in ascending and descending order in php

Method: 1. Use "sort (array)" to sort in ascending order; 2. Use "rsort (array)" to sort in descending order; 3. Use array_merge_recursive() to merge ascending arrays and descending arrays, the syntax "array_merge_recursive" (Ascending array, Descending array)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php ascends the array Method of finding the union after descending order

Step 1: Use the sort() function to sort the array in ascending order

<?php
header("Content-type:text/html;charset=utf-8");
$arr = array(10, 23, 5, 12, 84, 16);
var_dump($arr);
sort($arr);
$arr1=$arr;
var_dump($arr1);
?>

Step 2: Use rsort() function to sort the array in descending order

<?php
header("Content-type:text/html;charset=utf-8");
$arr = array(10, 23, 5, 12, 84, 16);
var_dump($arr);
rsort($arr);
$arr2=$arr;
var_dump($arr2);
?>

Step 3: Compare ascending array and descending order The key name and key value of the array, get the union

Use the array_merge_recursive() function to merge the ascending sorted array and the descending sorted array

<?php
header("Content-type:text/html;charset=utf-8");
$arr = array(10, 23, 5, 12, 84, 16);
sort($arr);
$arr1=$arr;

rsort($arr);
$arr2=$arr;
$c = array_merge_recursive($arr1,$arr2);
var_dump($c);
?>

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