From 4585195977b1a2021412d6c419f62d7a1f7c1850 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Fri, 16 May 2014 11:09:28 +0000
Subject: [PATCH] Filter out empty and duplicate values in Comment Moderation
 and Comment Blacklist settings.

props GaVrA.
fixes #23800.

git-svn-id: https://develop.svn.wordpress.org/trunk@28444 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/formatting.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/wp-includes/formatting.php b/src/wp-includes/formatting.php
index 5efe0cdadb..aef9c5555c 100644
--- a/src/wp-includes/formatting.php
+++ b/src/wp-includes/formatting.php
@@ -3289,6 +3289,14 @@ function sanitize_option($option, $value) {
 			if ( ! get_role( $value ) && get_role( 'subscriber' ) )
 				$value = 'subscriber';
 			break;
+
+		case 'moderation_keys':
+		case 'blacklist_keys':
+			$value = explode( "\n", $value );
+			$value = array_filter( array_map( 'trim', $value ) );
+			$value = array_unique( $value );
+			$value = implode( "\n", $value );
+			break;
 	}
 
 	/**