初始上传

extend/exception/StockException.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace extend\exception;
+
+use RuntimeException;
+use Throwable;
+
+/**
+ * 库存错误异常处理类
+ */
+class StockException extends RuntimeException
+{
+    public function __construct($message = "", $code = -1, Throwable $previous = null)
+    {
+
+        parent::__construct($message, $code, $previous);
+    }
+}