fixed v3.1-stable

nguyenanhung · Jun 16, 2023 · 06a9cf3 · 06a9cf3
1 parent 4dffbf3
commit 06a9cf3
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/helpers/common.php b/helpers/common.php
@@ -10,6 +10,9 @@
 if (!function_exists('bear_str_to_lower')) {
 	function bear_str_to_lower($str)
 	{
+		if ($str === null) {
+			return null;
+		}
 		if (function_exists('mb_strtolower')) {
 			return mb_strtolower($str, 'UTF-8');
 		}
@@ -20,6 +23,9 @@ function bear_str_to_lower($str)
 if (!function_exists('bear_str_to_upper')) {
 	function bear_str_to_upper($str)
 	{
+		if ($str === null) {
+			return null;
+		}
 		if (function_exists('mb_strtoupper')) {
 			return mb_strtoupper($str, 'UTF-8');
 		}
@@ -30,6 +36,9 @@ function bear_str_to_upper($str)
 if (!function_exists('bear_str_length')) {
 	function bear_str_length($str)
 	{
+		if ($str === null) {
+			return null;
+		}
 		if (function_exists('mb_strlen')) {
 			return mb_strlen($str);
 		}