Respect display_errors when deciding if to display an error -- useful for environments where you want to log errors, but not show them.
diff --git a/system/core/Common.php b/system/core/Common.php
index c309d41..1e78761 100644
--- a/system/core/Common.php
+++ b/system/core/Common.php
@@ -526,7 +526,8 @@
 
 		// Should we display the error? We'll get the current error_reporting
 		// level and add its bits with the severity bits to find out.
-		if (($severity & error_reporting()) === $severity)
+        // And respect display_errors
+		if (($severity & error_reporting()) === $severity && (bool) ini_get('display_errors') === TRUE)
 		{
 			$_error->show_php_error($severity, $message, $filepath, $line);
 		}