Revert "bug #17052 [2.7] Fixed flatten exception recursion with errors (GrahamCampbell)"

This reverts commit af3f4eaa2b37bca77274b670e96a695f3e46c4e5, reversing
changes made to 021ab8a7b35cac053442124e04cd87e2e1ef43cd.

Debug.php

@@ -44,7 +44,7 @@ class Debug
         error_reporting(-1);
 
         ErrorHandler::register($errorReportingLevel, $displayErrors);
-        if ('cli' !== PHP_SAPI) {
+        if ('cli' !== php_sapi_name()) {
             ExceptionHandler::register();
         // CLI - display errors only if they're not already logged to STDERR
         } elseif ($displayErrors && (!ini_get('log_errors') || ini_get('error_log'))) {

ExceptionHandler.php

@@ -141,7 +141,7 @@ class ExceptionHandler
                     $ind = $count - $position + 1;
                     $class = $this->abbrClass($e['class']);
                     $message = nl2br(htmlspecialchars($e['message'], $flags, $this->charset));
-                    $content .= sprintf(<<<'EOF'
+                    $content .= sprintf(<<<EOF
                         <div class="block_exception clear_fix">
                             <h2><span>%d/%d</span> %s: %s</h2>
                         </div>
@@ -196,7 +196,7 @@ EOF;
      */
     public function getStylesheet(FlattenException $exception)
     {
-        return <<<'EOF'
+        return <<<EOF
             .sf-reset { font: 11px Verdana, Arial, sans-serif; color: #333 }
             .sf-reset .clear { clear:both; height:0; font-size:0; line-height:0; }
             .sf-reset .clear_fix:after { display:block; height:0; clear:both; visibility:hidden; }

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2016 Fabien Potencier
+Copyright (c) 2004-2015 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,13 +1,44 @@
 Debug Component
 ===============
 
-The Debug component provides tools to ease debugging PHP code.
+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\ErrorHandler;
+use Symfony\Component\Debug\ExceptionHandler;
+
+error_reporting(-1);
+
+ErrorHandler::register($errorReportingLevel);
+if ('cli' !== php_sapi_name()) {
+    ExceptionHandler::register();
+} elseif (!ini_get('log_errors') || ini_get('error_log')) {
+    ini_set('display_errors', 1);
+}
+```
+
+Note that the `Debug::enable()` call also registers the debug class loader
+from the Symfony ClassLoader component when available.
+
+This component can optionally take advantage of the features of the HttpKernel
+and HttpFoundation components.
 
 Resources
 ---------
 
-  * [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)
+You can run the unit tests with the following command:
+
+    $ cd path/to/Symfony/Component/Debug/
+    $ composer install
+    $ phpunit