From 861673971181238f3e5d3484ddbf3c2c006d077c Mon Sep 17 00:00:00 2001
From: Marcin Kurzyna <m.kurzyna@crystalpoint.pl>
Date: Thu, 5 Jul 2012 22:17:27 +0200
Subject: [PATCH] Fix #49510: boolean validation fails with
 FILTER_NULL_ON_FAILURE

Fix empty strings validation (treat it as correct false value).
---
 ext/filter/logical_filters.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ext/filter/logical_filters.c b/ext/filter/logical_filters.c
index 5c3811ab255e..7dc81abe721a 100644
--- a/ext/filter/logical_filters.c
+++ b/ext/filter/logical_filters.c
@@ -241,6 +241,9 @@ void php_filter_boolean(PHP_INPUT_FILTER_PARAM_DECL) /* {{{ */
 	 * returns false for "0", "false", "off", "no", and ""
 	 * null otherwise. */
 	switch (len) {
+		case 0:
+			ret = 0;
+			break;
 		case 1:
 			if (*str == '1') {
 				ret = 1;