缩短了快速入库跟踪号，方便现场输入

app/Http/Controllers/StoreController.php

@@ -209,7 +209,7 @@ class StoreController extends Controller
         $items = [];
         $toDay = Carbon::now()->toDateTimeString();
         $depositories = [];
-        $traceId = explode('.',microtime(true))[0];
+        $traceId = rand(100,999);
         foreach ($details as $detail) {
             $result = $this->executeSP($detail,$asnno,$depository_code,$db,$quality,$conn,$sql_sp,$traceId);
             if (substr($result, 0, 3) != '000') {

public/t.php

@@ -1,8 +1,4 @@
 <?php
 
-$a= null ?? false;
-
-$b= [] ?? false;
-
-var_dump($a);
-var_dump($b);
+$a = '12345678.12345';
+echo substr($a, 2, 2);