PHP历理 合并数组后去重排序

<?php
session_start();
define('CHAOYI',true);
require  $_SERVER['DOCUMENT_ROOT'].'/_/_php/data/database.php';
require ROOT.'_php/data/common.php';
require ROOT.'_php/data/config.php';

$arr1 = ['this', 'time', 'the', 'these'];
$arr2 = ['the', 'two', 'this', 'tree'];

// 合并数组
$merged = array_merge($arr1, $arr2);
// 去重
$uniqueArr = array_unique($merged);
sort($uniqueArr);  // 升序，若降序用 rsort($uniqueArr)
print_r($uniqueArr);

mysqli_close($conn);
exit;

效果图：

Array ( [0] => the [1] => these [2] => this [3] => time [4] => tree [5] => two )