1 <?php
 2 $arr = [
 3     1 => ‘Zhangbiyu‘,
 4     2 => ‘Love‘,
 5     3 => ‘Lvpeilin‘,
 6 ];
 7 
 8 echo ‘May ‘ . implode(‘ ‘,$arr) ."!\n";
 9 krsort($arr);
10 echo ‘But Must ‘ .implode(‘ ‘,$arr)."!\n";