大写

application/api/controller/Raffle.php

@@ -272,6 +272,7 @@ class Raffle extends Api
         $prize_arr = $this->getPrize($info['r_id'])['new'];
         $data=array();
         $alphabet = "abcdefghijklmnopqrstuvwxyz";
+        $alphabet=strtoupper($alphabet);
         for($i=0;$i<20;$i++){
             $alphabet = str_shuffle($alphabet);
             $result = substr($alphabet, 0, 1);