first push

app/common/service/UserService.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace app\common\service;
+
+use app\model\User;
+
+class UserService
+{
+    public static function getInfo($userId)
+    {
+        $user = User::with('roles')->find($userId);
+        if (!$user) return null;
+        return [
+            'id' => $user->id,
+            'username' => $user->username,
+            'roles' => $user->roles->pluck('name')->toArray(),
+            // 可扩展其他字段
+        ];
+    }
+}