From 668abfee8077706134dbedbf9efcdd7b3285e273 Mon Sep 17 00:00:00 2001
From: Vincent Petry <PVince81@yahoo.fr>
Date: Fri, 2 Dec 2016 14:57:57 +0100
Subject: [PATCH] Prevent duplicate closeCallback calls in case of GC ghosts

Sometimes PHP 7 GC decides to call stream_close again even after the
PHP request has ended, and even if fclose was called before already.
---
 src/CallbackWrapper.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/CallbackWrapper.php b/src/CallbackWrapper.php
index c5847b9..4eef556 100644
--- a/src/CallbackWrapper.php
+++ b/src/CallbackWrapper.php
@@ -107,6 +107,8 @@ public function stream_close() {
 		$result = parent::stream_close();
 		if (is_callable($this->closeCallback)) {
 			call_user_func($this->closeCallback);
+			// prevent further calls by potential PHP 7 GC ghosts
+			$this->closeCallback = null;
 		}
 		return $result;
 	}