Added method Debug::getRefCount($object). (#4331)

Author: limingxinleo

src/Debug.php

@@ -0,0 +1,30 @@
+<?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 Hyperf\Testing;
+
+class Debug
+{
+    public static function getRefCount($object): string
+    {
+        ob_start();
+        debug_zval_dump($object);
+        $data = ob_get_clean();
+
+        preg_match('/refcount\((\w+)\)/U', $data, $matched);
+        $result = $matched[1];
+        if(is_numeric($result)){
+            return bcsub($result, '1');
+        }
+
+        return $matched[1];
+    }
+}