From c58e63e92757b70f255dcc1347d4442059328df6 Mon Sep 17 00:00:00 2001
From: Isaac Connor <isaac@zoneminder.com>
Date: Mon, 6 Jun 2022 13:53:33 -0400
Subject: [PATCH] Don't turn '0' into ''

---
 web/includes/functions.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/web/includes/functions.php b/web/includes/functions.php
index f521afab2..ea2fc82c1 100644
--- a/web/includes/functions.php
+++ b/web/includes/functions.php
@@ -2011,19 +2011,19 @@ function validNum( $input ) {
 
 // For general strings
 function validStr($input) {
-  if(!$input) return '';
+  if (is_null($input)) return '';
   return strip_tags($input);
 }
 
 // For strings in javascript or tags etc, expected to be in quotes so further quotes escaped rather than converted
 function validJsStr($input) {
-  if(!$input) return '';
+  if (is_null($input)) return '';
   return strip_tags(addslashes($input));
 }
 
 // For general text in pages outside of tags or quotes so quotes converted to entities
 function validHtmlStr($input) {
-  if(!$input) return '';
+  if (is_null($input)) return '';
   return htmlspecialchars($input, ENT_QUOTES);
 }