Fixed bug that uploadedFile was incompatibility with php 8.1 (#4655)

Co-authored-by: 李铭昕 <[email protected]>

Author: yanghaixi

src/Upload/UploadedFile.php

@@ -175,9 +175,9 @@ public function moveTo($targetPath)
      * the file in the $_FILES array if available, as PHP calculates this based
      * on the actual size transmitted.
      *
-     * @return null|int the file size in bytes or null if unknown
+     * @return false|int the file size in bytes or null if unknown
      */
-    public function getSize()
+    public function getSize(): int|false
     {
         return $this->size;
     }

tests/Upload/UploadedFileTest.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * This file is part of Hyperf.
+ *
+ * @link     https://www.hyperf.io
+ * @document https://hyperf.wiki
+ * @contact  [email protected]
+ * @license  https://github.com/hyperf/hyperf/blob/master/LICENSE
+ */
+namespace HyperfTest\HttpMessage\Upload;
+
+use Hyperf\HttpMessage\Upload\UploadedFile;
+use Mockery;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @internal
+ * @coversNothing
+ */
+class UploadedFileTest extends TestCase
+{
+    protected function tearDown(): void
+    {
+        Mockery::close();
+    }
+
+    public function testGetSize()
+    {
+        $file = new UploadedFile('', 10, 0);
+
+        $this->assertSame(10, $file->getSize());
+    }
+}