改进代码

library/think/Cache.php

@@ -22,7 +22,7 @@ class Cache
      * @var object
      * @access protected
      */
-    protected static $handler = null;
+    protected static $handler;
 
     /**
      * 连接缓存

library/think/Controller.php

@@ -22,7 +22,7 @@ class Controller
     use \traits\controller\Jump;
 
     // 视图类实例
-    protected $view = null;
+    protected $view;
     // Request实例
     protected $request;
     // 验证失败是否抛出异常

library/think/Template.php

@@ -52,7 +52,7 @@ class Template
 
     private $literal     = [];
     private $includeFile = []; // 记录所有模板包含的文件路径及更新时间
-    protected $storage   = null;
+    protected $storage;
 
     /**
      * 架构函数

library/think/Validate.php

@@ -18,7 +18,7 @@ use think\Request;
 class Validate
 {
     // 实例
-    protected static $instance = null;
+    protected static $instance;
 
     // 自定义的验证类型
     protected static $type = [];

library/think/view/driver/Think.php

@@ -19,7 +19,7 @@ use think\Template;
 class Think
 {
     // 模板引擎实例
-    private $template = null;
+    private $template;
     // 模板引擎参数
     protected $config = [
         // 模板起始路径