Merge branch '2.7' into 2.8

* 2.7:
  [FrameworkBundle] Check for class existence before is_subclass_of
  Update GroupSequence.php
  Code enhancement and cleanup
  [DI] Add anti-regression test
  Revert "minor #19689 [DI] Cleanup array_key_exists (ro0NL)"
  [BrowserKit] Fix cookie expiration on 32 bit systems
  bumped Symfony version to 2.7.18
  updated VERSION for 2.7.17
  update CONTRIBUTORS for 2.7.17
  updated CHANGELOG for 2.7.17
  Update misleading comment about RFC4627

Debug.php

@@ -45,7 +45,7 @@ class Debug
             error_reporting(-1);
         }
 
-        if ('cli' !== php_sapi_name()) {
+        if ('cli' !== PHP_SAPI) {
             ini_set('display_errors', 0);
             ExceptionHandler::register();
         } elseif ($displayErrors && (!ini_get('log_errors') || ini_get('error_log'))) {

DebugClassLoader.php

@@ -51,7 +51,26 @@ class DebugClassLoader
         }
 
         if (!isset(self::$caseCheck)) {
-            self::$caseCheck = false !== stripos(PHP_OS, 'win') ? (false !== stripos(PHP_OS, 'darwin') ? 2 : 1) : 0;
+            $file = file_exists(__FILE__) ? __FILE__ : rtrim(realpath('.'), DIRECTORY_SEPARATOR);
+            $i = strrpos($file, DIRECTORY_SEPARATOR);
+            $dir = substr($file, 0, 1 + $i);
+            $file = substr($file, 1 + $i);
+            $test = strtoupper($file) === $file ? strtolower($file) : strtoupper($file);
+            $test = realpath($dir.$test);
+
+            if (false === $test || false === $i) {
+                // filesystem is case sensitive
+                self::$caseCheck = 0;
+            } elseif (substr($test, -strlen($file)) === $file) {
+                // filesystem is case insensitive and realpath() normalizes the case of characters
+                self::$caseCheck = 1;
+            } elseif (false !== stripos(PHP_OS, 'darwin')) {
+                // on MacOSX, HFS+ is case insensitive but realpath() doesn't normalize the case of characters
+                self::$caseCheck = 2;
+            } else {
+                // filesystem case checks failed, fallback to disabling them
+                self::$caseCheck = 0;
+            }
         }
     }
 
@@ -156,6 +175,10 @@ class DebugClassLoader
         } catch (\Exception $e) {
             ErrorHandler::unstackErrors();
 
+            throw $e;
+        } catch (\Throwable $e) {
+            ErrorHandler::unstackErrors();
+
             throw $e;
         }
 
@@ -193,17 +216,17 @@ class DebugClassLoader
                             break;
                     }
                 }
-                $parent = $refl->getParentClass();
+                $parent = get_parent_class($class);
 
-                if (!$parent || strncmp($ns, $parent->name, $len)) {
-                    if ($parent && isset(self::$deprecated[$parent->name]) && strncmp($ns, $parent->name, $len)) {
-                        @trigger_error(sprintf('The %s class extends %s that is deprecated %s', $name, $parent->name, self::$deprecated[$parent->name]), E_USER_DEPRECATED);
+                if (!$parent || strncmp($ns, $parent, $len)) {
+                    if ($parent && isset(self::$deprecated[$parent]) && strncmp($ns, $parent, $len)) {
+                        @trigger_error(sprintf('The %s class extends %s that is deprecated %s', $name, $parent, self::$deprecated[$parent]), E_USER_DEPRECATED);
                     }
 
                     $parentInterfaces = array();
                     $deprecatedInterfaces = array();
                     if ($parent) {
-                        foreach ($parent->getInterfaceNames() as $interface) {
+                        foreach (class_implements($parent) as $interface) {
                             $parentInterfaces[$interface] = 1;
                         }
                     }
@@ -241,7 +264,7 @@ class DebugClassLoader
                 $i = count($tail) - 1;
                 $j = count($real) - 1;
 
-                 while (isset($tail[$i], $real[$j]) && $tail[$i] === $real[$j]) {
+                while (isset($tail[$i], $real[$j]) && $tail[$i] === $real[$j]) {
                     --$i;
                     --$j;
                 }

ErrorHandler.php

@@ -283,7 +283,7 @@ class ErrorHandler
     public function throwAt($levels, $replace = false)
     {
         $prev = $this->thrownErrors;
-        $this->thrownErrors = (E_ALL | E_STRICT) & ($levels | E_RECOVERABLE_ERROR | E_USER_ERROR) & ~E_USER_DEPRECATED & ~E_DEPRECATED;
+        $this->thrownErrors = ($levels | E_RECOVERABLE_ERROR | E_USER_ERROR) & ~E_USER_DEPRECATED & ~E_DEPRECATED;
         if (!$replace) {
             $this->thrownErrors |= $prev;
         }
@@ -375,12 +375,14 @@ class ErrorHandler
     /**
      * Handles errors by filtering then logging them according to the configured bit fields.
      *
-     * @param int    $type    One of the E_* constants
+     * @param int    $type      One of the E_* constants
+     * @param string $message
      * @param string $file
      * @param int    $line
      * @param array  $context
+     * @param array  $backtrace
      *
-     * @return bool Returns false when no handling happens so that the PHP engine can handle the error itself.
+     * @return bool Returns false when no handling happens so that the PHP engine can handle the error itself
      *
      * @throws \ErrorException When $this->thrownErrors requests so
      *
@@ -517,6 +519,10 @@ class ErrorHandler
             } catch (\Exception $e) {
                 $this->isRecursive = false;
 
+                throw $e;
+            } catch (\Throwable $e) {
+                $this->isRecursive = false;
+
                 throw $e;
             }
         }
@@ -539,7 +545,7 @@ class ErrorHandler
         }
         $type = $exception instanceof FatalErrorException ? $exception->getSeverity() : E_ERROR;
 
-        if ($this->loggedErrors & $type) {
+        if (($this->loggedErrors & $type) || $exception instanceof FatalThrowableError) {
             $e = array(
                 'type' => $type,
                 'file' => $exception->getFile(),
@@ -566,9 +572,9 @@ class ErrorHandler
             } else {
                 $message = 'Uncaught Exception: '.$exception->getMessage();
             }
-            if ($this->loggedErrors & $e['type']) {
-                $this->loggers[$e['type']][0]->log($this->loggers[$e['type']][1], $message, $e);
-            }
+        }
+        if ($this->loggedErrors & $type) {
+            $this->loggers[$type][0]->log($this->loggers[$type][1], $message, $e);
         }
         if ($exception instanceof FatalErrorException && !$exception instanceof OutOfMemoryException && $error) {
             foreach ($this->getFatalErrorHandlers() as $handler) {
@@ -625,6 +631,8 @@ class ErrorHandler
             }
         } catch (\Exception $exception) {
             // Handled below
+        } catch (\Throwable $exception) {
+            // Handled below
         }
 
         if ($error && $error['type'] &= E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR) {

Exception/FatalThrowableError.php

@@ -27,7 +27,7 @@ class FatalThrowableError extends FatalErrorException
             $message = 'Type error: '.$e->getMessage();
             $severity = E_RECOVERABLE_ERROR;
         } else {
-            $message = 'Fatal error: '.$e->getMessage();
+            $message = $e->getMessage();
             $severity = E_ERROR;
         }
 

Exception/FlattenException.php

@@ -263,7 +263,10 @@ class FlattenException extends LegacyFlattenException
             if (++$count > 1e4) {
                 return array('array', '*SKIPPED over 10000 entries*');
             }
-            if (is_object($value)) {
+            if ($value instanceof \__PHP_Incomplete_Class) {
+                // is_object() returns false on PHP<=7.1
+                $result[$key] = array('incomplete-object', $this->getClassNameFromIncomplete($value));
+            } elseif (is_object($value)) {
                 $result[$key] = array('object', get_class($value));
             } elseif (is_array($value)) {
                 if ($level > 10) {
@@ -277,9 +280,6 @@ class FlattenException extends LegacyFlattenException
                 $result[$key] = array('boolean', $value);
             } elseif (is_resource($value)) {
                 $result[$key] = array('resource', get_resource_type($value));
-            } elseif ($value instanceof \__PHP_Incomplete_Class) {
-                // Special case of object, is_object will return false
-                $result[$key] = array('incomplete-object', $this->getClassNameFromIncomplete($value));
             } else {
                 $result[$key] = array('string', (string) $value);
             }

ExceptionHandler.php

@@ -96,7 +96,7 @@ class ExceptionHandler
      *
      * @param string $format The format for links to source files
      *
-     * @return string The previous file link format.
+     * @return string The previous file link format
      */
     public function setFileLinkFormat($format)
     {
@@ -342,6 +342,7 @@ EOF;
                 border-bottom:1px solid #ccc;
                 border-right:1px solid #ccc;
                 border-left:1px solid #ccc;
+                word-wrap: break-word;
             }
             .sf-reset .block_exception { background-color:#ddd; color: #333; padding:20px;
                 -webkit-border-top-left-radius: 16px;

README.md

@@ -1,42 +1,13 @@
 Debug Component
 ===============
 
-Debug provides tools to make debugging easier.
-
-Enabling all debug tools is as easy as calling the `enable()` method on the
-main `Debug` class:
-
-```php
-use Symfony\Component\Debug\Debug;
-
-Debug::enable();
-```
-
-You can also use the tools individually:
-
-```php
-use Symfony\Component\Debug\DebugClassLoader;
-use Symfony\Component\Debug\ErrorHandler;
-use Symfony\Component\Debug\ExceptionHandler;
-
-if ('cli' !== php_sapi_name()) {
-    ini_set('display_errors', 0);
-    ExceptionHandler::register();
-} elseif (!ini_get('log_errors') || ini_get('error_log')) {
-    ini_set('display_errors', 1);
-}
-ErrorHandler::register();
-DebugClassLoader::enable();
-```
-
-This component can optionally take advantage of the features of the HttpKernel
-and HttpFoundation components.
+The Debug component provides tools to ease debugging PHP code.
 
 Resources
 ---------
 
-You can run the unit tests with the following command:
-
-    $ cd path/to/Symfony/Component/Debug/
-    $ composer install
-    $ phpunit
+  * [Documentation](https://symfony.com/doc/current/components/debug/index.html)
+  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+  * [Report issues](https://github.com/symfony/symfony/issues) and
+    [send Pull Requests](https://github.com/symfony/symfony/pulls)
+    in the [main Symfony repository](https://github.com/symfony/symfony)

Resources/ext/README.md

@@ -1,7 +1,9 @@
-Symfony Debug Extension
-=======================
+Symfony Debug Extension for PHP 5
+=================================
 
 This extension publishes several functions to help building powerful debugging tools.
+It is compatible with PHP 5.3, 5.4, 5.5 and 5.6; with ZTS and non-ZTS modes.
+It is not required thus not provided for PHP 7.
 
 symfony_zval_info()
 -------------------
@@ -122,7 +124,6 @@ array(3) {
 Usage
 -----
 
-The extension is compatible with ZTS mode, and should be supported by PHP5.3, 5.4, 5.5 and 5.6.
 To enable the extension from source, run:
 
 ```

Tests/DebugClassLoaderTest.php

@@ -13,12 +13,11 @@ namespace Symfony\Component\Debug\Tests;
 
 use Symfony\Component\Debug\DebugClassLoader;
 use Symfony\Component\Debug\ErrorHandler;
-use Symfony\Component\Debug\Exception\ContextErrorException;
 
 class DebugClassLoaderTest extends \PHPUnit_Framework_TestCase
 {
     /**
-     * @var int Error reporting level before running tests.
+     * @var int Error reporting level before running tests
      */
     private $errorReporting;
 
@@ -175,7 +174,7 @@ class DebugClassLoaderTest extends \PHPUnit_Framework_TestCase
      */
     public function testDeprecatedSuper($class, $super, $type)
     {
-        set_error_handler(function() { return false; });
+        set_error_handler(function () { return false; });
         $e = error_reporting(0);
         trigger_error('', E_USER_DEPRECATED);
 
@@ -205,7 +204,7 @@ class DebugClassLoaderTest extends \PHPUnit_Framework_TestCase
 
     public function testInterfaceExtendsDeprecatedInterface()
     {
-        set_error_handler(function() { return false; });
+        set_error_handler(function () { return false; });
         $e = error_reporting(0);
         trigger_error('', E_USER_NOTICE);
 
@@ -227,7 +226,7 @@ class DebugClassLoaderTest extends \PHPUnit_Framework_TestCase
 
     public function testDeprecatedSuperInSameNamespace()
     {
-        set_error_handler(function() { return false; });
+        set_error_handler(function () { return false; });
         $e = error_reporting(0);
         trigger_error('', E_USER_NOTICE);
 
@@ -253,7 +252,7 @@ class DebugClassLoaderTest extends \PHPUnit_Framework_TestCase
             $this->markTestSkipped('PHP7 already prevents using reserved names.');
         }
 
-        set_error_handler(function() { return false; });
+        set_error_handler(function () { return false; });
         $e = error_reporting(0);
         trigger_error('', E_USER_NOTICE);
 

Tests/ErrorHandlerTest.php

@@ -484,6 +484,24 @@ class ErrorHandlerTest extends \PHPUnit_Framework_TestCase
         }
     }
 
+    /**
+     * @requires PHP 7
+     */
+    public function testHandleErrorException()
+    {
+        $exception = new \Error("Class 'Foo' not found");
+
+        $handler = new ErrorHandler();
+        $handler->setExceptionHandler(function () use (&$args) {
+            $args = func_get_args();
+        });
+
+        $handler->handleException($exception);
+
+        $this->assertInstanceOf('Symfony\Component\Debug\Exception\ClassNotFoundException', $args[0]);
+        $this->assertStringStartsWith("Attempted to load class \"Foo\" from the global namespace.\nDid you forget a \"use\" statement", $args[0]->getMessage());
+    }
+
     public function testHandleFatalErrorOnHHVM()
     {
         try {

Tests/MockExceptionHandler.php

@@ -13,7 +13,7 @@ namespace Symfony\Component\Debug\Tests;
 
 use Symfony\Component\Debug\ExceptionHandler;
 
-class MockExceptionHandler extends Exceptionhandler
+class MockExceptionHandler extends ExceptionHandler
 {
     public $e;