update

app/Http/Controllers/Mobile/BookController.php

@@ -26,7 +26,7 @@ class BookController extends Controller
         // 分类数据
         $category = Book::get()->implode('category', ',');
         $category = explode(',', $category);
-        $category = array_unique($category);
+        $category = array_values(array_unique($category));
         return $this->success(compact('category'));
     }