bug symfony#22424 [Debug] Set exit status to 255 on error (nicolas-grekas)

This PR was merged into the 2.7 branch.

Discussion
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[Debug] Set exit status to 255 on error

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes (no easily testable in fact)
| Fixed tickets | symfony#20775
| License       | MIT
| Doc PR        | -

Commits
-------

67e249d [Debug] Set exit status to 255 on error

Author: fabpot

src/Symfony/Component/Debug/ErrorHandler.php

@@ -101,6 +101,7 @@ class ErrorHandler
     private static $reservedMemory;
     private static $stackedErrors = array();
     private static $stackedErrorLevels = array();
+    private static $exitCode = 0;
 
     /**
      * Same init value as thrownErrors.
@@ -477,6 +478,9 @@ public function handleError($type, $message, $file, $line)
      */
     public function handleException($exception, array $error = null)
     {
+        if (null === $error) {
+            self::$exitCode = 255;
+        }
         if (!$exception instanceof \Exception) {
             $exception = new FatalThrowableError($exception);
         }
@@ -562,7 +566,7 @@ public static function handleFatalError(array $error = null)
             return;
         }
 
-        if (null === $error) {
+        if ($exit = null === $error) {
             $error = error_get_last();
         }
 
@@ -586,15 +590,21 @@ public static function handleFatalError(array $error = null)
             } else {
                 $exception = new FatalErrorException($handler->levels[$error['type']].': '.$error['message'], 0, $error['type'], $error['file'], $error['line'], 2, true, $trace);
             }
-        } elseif (!isset($exception)) {
-            return;
         }
 
         try {
-            $handler->handleException($exception, $error);
+            if (isset($exception)) {
+                self::$exitCode = 255;
+                $handler->handleException($exception, $error);
+            }
         } catch (FatalErrorException $e) {
             // Ignore this re-throw
         }
+
+        if ($exit && self::$exitCode) {
+            $exitCode = self::$exitCode;
+            register_shutdown_function('register_shutdown_function', function () use ($exitCode) { exit($exitCode); });
+        }
     }
 
     /**