From e978b6a67a942f954efcfb49a1793eaf038a63ad Mon Sep 17 00:00:00 2001
From: Alessandro Lai <alessandro.lai85@gmail.com>
Date: Fri, 16 Mar 2018 12:45:40 +0100
Subject: [PATCH] Add failing test case to reproduce #26438

---
 .../avoid_loop_with_exception_handler.phpt    | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 src/Symfony/Component/Debug/Tests/phpt/avoid_loop_with_exception_handler.phpt

diff --git a/src/Symfony/Component/Debug/Tests/phpt/avoid_loop_with_exception_handler.phpt b/src/Symfony/Component/Debug/Tests/phpt/avoid_loop_with_exception_handler.phpt
new file mode 100644
index 0000000000000..29cf4f1c8fb39
--- /dev/null
+++ b/src/Symfony/Component/Debug/Tests/phpt/avoid_loop_with_exception_handler.phpt
@@ -0,0 +1,55 @@
+--TEST--
+Test that, when handling a fatal, we don't create a loop with a third party exception handler installed after ours
+--FILE--
+<?php
+
+namespace Symfony\Component\Debug;
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+class ThirdPartyExceptionHandler
+{
+    private static $prevErrorHandler;
+    private static $prevExceptionHandler;
+    
+    public static function register()
+    {
+        static::$prevErrorHandler = set_error_handler([__CLASS__, 'handleError']);
+        static::$prevExceptionHandler = set_exception_handler([__CLASS__, 'handleException']);
+    }
+
+    public static function handleError($e)
+    {
+        echo 'Third party error handler' . PHP_EOL;
+        echo 'Calling previous handler: ' . get_class(static::$prevErrorHandler[0]) . PHP_EOL;
+        return call_user_func(static::$prevErrorHandler, $e);
+    }
+
+    public static function handleException($e)
+    {
+        echo 'Third party exception handler' . PHP_EOL;
+        echo 'Calling previous handler: ' . get_class(static::$prevExceptionHandler[0]) . PHP_EOL;
+        return call_user_func(static::$prevExceptionHandler, $e);
+    }
+}
+
+ErrorHandler::register();
+ThirdPartyExceptionHandler::register();
+ini_set('display_errors', 1);
+
+$a = null;
+require 'inexistent_file.php';
+?>
+--EXPECTF--
+Third party error handler
+Calling previous handler: Symfony\Component\Debug\ErrorHandler
+Third party exception handler
+Calling previous handler: Symfony\Component\Debug\ErrorHandler
+Uncaught Exception: foo
+Fatal error: Uncaught %s
+Stack trace:
+%a