From 5c2d25aa77625897e12aca6de5b5fa63f36af938 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Fri, 16 May 2014 11:10:14 +0000
Subject: [PATCH] Filter out empty and duplicate values in Comment Moderation
 and Comment Blacklist settings.

props GaVrA.
fixes #23800.
Built from https://develop.svn.wordpress.org/trunk@28444


git-svn-id: http://core.svn.wordpress.org/trunk@28271 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/formatting.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index 5efe0cdadb..aef9c5555c 100644
--- a/wp-includes/formatting.php
+++ b/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;
 	}
 
 	/**