新增默认File对象

application/common/library/File.php

@@ -0,0 +1,32 @@
+<?php
+namespace app\common\library;
+
+class File extends \think\File implements \ArrayAccess
+{
+
+    public function __construct($filename, $mode = 'r')
+    {
+
+        parent::__construct($filename, $mode);
+    }
+
+    public function offsetExists($offset)
+    {
+        return isset($this->info[$offset]);
+    }
+
+    public function offsetGet($offset)
+    {
+        return $this->info[$offset];
+    }
+
+    public function offsetSet($offset, $value)
+    {
+        $this->info[$offset] = $value;
+    }
+
+    public function offsetUnset($offset)
+    {
+        unset($this->info[$offset]);
+    }
+}