From ef7760a50d8a5c09e10a4f0f74ff943171f6c94f Mon Sep 17 00:00:00 2001
From: =?utf8?q?Gerg=C5=91=20Tisza?= <tgr.huwiki@gmail.com>
Date: Thu, 29 Oct 2015 13:49:11 -0700
Subject: [PATCH] Include preg_last_error() in error message when preg_* fails

Bug: T115514
Bug: T117066
Change-Id: I1d13f8542a4cf11c8e87cd4f6a983fa852dfdf1e
---
 includes/MagicWord.php | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/includes/MagicWord.php b/includes/MagicWord.php
index 424735e51b..17c7cd4914 100644
--- a/includes/MagicWord.php
+++ b/includes/MagicWord.php
@@ -954,7 +954,8 @@ class MagicWordArray {
 			$matches = array();
 			$matched = preg_match_all( $regex, $text, $matches, PREG_SET_ORDER );
 			if ( $matched === false ) {
-				throw new Exception( __METHOD__ . ': preg_match_all returned false' );
+				throw new Exception( __METHOD__ . ': preg_match_all returned false with error code '
+					. preg_last_error() );
 			}
 			if ( $matched ) {
 				foreach ( $matches as $m ) {
@@ -966,7 +967,8 @@ class MagicWordArray {
 			if ( $replaced !== null ) {
 				$text = $replaced;
 			} else {
-				throw new Exception( __METHOD__ . ': preg_replace returned null' );
+				throw new Exception( __METHOD__ . ': preg_replace returned null with error code '
+					. preg_last_error() );
 			}
 		}
 		return $found;
-- 
2.20.1