Index: t3lib/config_default.php
===================================================================
--- t3lib/config_default.php	(Revision 7127)
+++ t3lib/config_default.php	(Arbeitskopie)
@@ -157,7 +157,7 @@
 			)
 		),
 		'useCachingFramework' => FALSE,			// Boolean: Enable this if you want to use the caching framework by default for the core caches cache_pages, cache_pagesection and cache_hash.
-		'displayErrors' => -1,					// Integer: -1,0,1,2. Configures whether PHP errors should be displayed. 0 = Do not display any PHP error messages. Overrides the value of "exceptionalErrors" and sets it to 0 (= no errors are turned into exceptions), the configured "productionExceptionHandler" is used as exception handler, 1 = Display error messages with the registered errorhandler. The configured "debugExceptionHandler" is used as exception handler. 2 = Display errors only if client matches TYPO3_CONF_VARS[SYS][devIPmask]. If devIPmask matches the users IP address  the configured "debugExceptionHandler" is used  for exceptions, if not  "productionExceptionHandler" will be used. -1 = Default setting. With this option, you can override the PHP setting "display_errors". If devIPmask matches the users IP address  the configured "debugExceptionHandler" is used  for exceptions, if not "productionExceptionHandler" will be used.
+		'displayErrors' => -1,					// Integer: -1,0,1,2. Configures whether PHP errors should be displayed. 0 = Do not display any PHP error messages. Overrides the value of "exceptionalErrors" and sets it to 0 (= no errors are turned into exceptions), the configured "productionExceptionHandler" is used as exception handler, 1 = Display error messages with the registered errorhandler. The configured "debugExceptionHandler" is used as exception handler. 2 = Display errors only if client matches TYPO3_CONF_VARS[SYS][devIPmask]. If devIPmask matches the users IP address  the configured "debugExceptionHandler" is used  for exceptions, if not  "productionExceptionHandler" will be used. -1 = Default setting. With this option, you can override the PHP setting "display_errors". If devIPmask matches the users IP address  the configured "debugExceptionHandler" is used  for exceptions, if not "productionExceptionHandler" will be used.  You can overwrite displayErrors setting for a specific run (e.g. in CLI) by setting TYPO3_DISPLAY_ERRORS environment variable.
 		'productionExceptionHandler'  => 't3lib_error_ProductionExceptionHandler',	// String: Classname to handle exceptions that might happen in the TYPO3-code. Leave empty to disable exception handling. Default: "t3lib_error_ProductionExceptionHandler". This exception handler displays a nice error message when something went wrong. The error message is logged to the configured logs. Note: The configured "productionExceptionHandler" is used if displayErrors is set to "0" or to "-1" and devIPmask doesn't match the users IP.
 		'debugExceptionHandler' => 't3lib_error_DebugExceptionHandler',				// String: Classname to handle exceptions that might happen in the TYPO3-code. Leave empty to disable exception handling. Default: "t3lib_error_DebugExceptionHandler". This exception handler displays the complete stack trace of any encountered exception. The error message and the stack trace  is logged to the configured logs. Note: The configured "debugExceptionHandler" is used if displayErrors is set to "1" and if displayErrors is "-1"  or "2" and the devIPmask matches the users IP.
 		'errorHandler' => 't3lib_error_ErrorHandler',	// String: Classname to handle PHP errors. E.g.: t3lib_error_ErrorHandler. This class displays and logs all errors that are registered as "errorHandlerErrors" ([SYS][errorHandlerErrors]). Leave empty to disable error handling. Errors can be logged to syslog (see: [SYS][systemLog]) to the installed developer log and to the "syslog" table. If an error is registered in "exceptionalErrors" ([SYS][exceptionalErrors]) it will be turned into an exception to be handled by the configured exceptionHandler.
@@ -508,6 +508,10 @@
 			$displayErrors = 0;
 		}
 	}
+		// Allow ENV variable to overwrite setting
+	if (isset($GLOBALS['_ENV']['TYPO3_DISPLAY_ERRORS'])) {
+		$displayErrors = $GLOBALS['_ENV']['TYPO3_DISPLAY_ERRORS'];
+	}
 	if ($displayErrors == 0)	{
 		$TYPO3_CONF_VARS['SC_OPTIONS']['errors']['exceptionalErrors'] = 0;
 	}