From 0c815fc27bd68e9b261c7e7bff8192d82a84e0c1 Mon Sep 17 00:00:00 2001
From: Kijin Sung <kijin@kijinsung.com>
Date: Wed, 4 Dec 2024 15:59:16 +0900
Subject: [PATCH] Fix incorrect return type of utf8_trim() if input string
 contains invalid UTF-8 sequence

---
 common/functions.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/functions.php b/common/functions.php
index d2b2d0d23..84147358d 100644
--- a/common/functions.php
+++ b/common/functions.php
@@ -692,7 +692,7 @@ function utf8_normalize_spaces($str, bool $multiline = false): string
  */
 function utf8_trim($str): string
 {
-	return preg_replace('/^[\s\pZ\pC]+|[\s\pZ\pC]+$/u', '', (string)$str);
+	return preg_replace('/^[\s\pZ\pC]+|[\s\pZ\pC]+$/u', '', (string)$str) ?? '';
 }
 
 /**