<?php
 
 /*
  * This file is part of the Symfony package.
  *
  * (c) Fabien Potencier <fabien@symfony.com>
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
 
 namespace Symfony\Component\Debug;
 
 /**
  * Registers all the debug tools.
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class Debug
 {
     private static $enabled = false;
 
     /**
      * Enables the debug tools.
      *
      * This method registers an error handler and an exception handler.
      *
      * @param int  $errorReportingLevel The level of error reporting you want
      * @param bool $displayErrors       Whether to display errors (for development) or just log them (for production)
      */
     public static function enable($errorReportingLevel = E_ALL, $displayErrors = true)
     {
         if (static::$enabled) {
             return;
         }
 
         static::$enabled = true;
 
         if (null !== $errorReportingLevel) {
             error_reporting($errorReportingLevel);
         } else {
             error_reporting(E_ALL);
         }
 
         if (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true)) {
             ini_set('display_errors', 0);
             ExceptionHandler::register();
         } elseif ($displayErrors && (!filter_var(ini_get('log_errors'), FILTER_VALIDATE_BOOLEAN) || ini_get('error_log'))) {
             // CLI - display errors only if they're not already logged to STDERR
             ini_set('display_errors', 1);
         }
         if ($displayErrors) {
             ErrorHandler::register(new ErrorHandler(new BufferingLogger()));
         } else {
             ErrorHandler::register()->throwAt(0, true);
         }
 
         DebugClassLoader::enable();
     }
 }