Update: fixed warning

src/Autoloader/Psr4.php

@@ -451,7 +451,7 @@ class Psr4
         $class = array_shift($args);
         $className = $this->getClassName($class);
         //如果实例化的参数发生变化，就重新实例化
-        $paramsHash = md5(var_export($args, true));
+        $paramsHash = md5(print_r($args, true));
         if (isset(self::$_loadedClass[$className]) && isset(self::$_loadedClassParams[$className])
             && self::$_loadedClassParams[$className] == $paramsHash) return self::$_loadedClass[$className];