--- fenglin/lib/str_process.inc.php	2025/04/29 11:55:32	1.18
+++ fenglin/lib/str_process.inc.php	2025/10/18 14:15:35	1.21
@@ -1,5 +1,5 @@
 <?php
-function str_length(string $str) : string
+function str_length(string $str) : int
 {
 	$len = strlen($str);
 	$ret = 0;
@@ -10,15 +10,14 @@ function str_length(string $str) : strin
 
 		// Process UTF-8 Chinese characters
 		$v1 = ord($c);
-		if (($v1 & 0b10000000) == 0b10000000) //head of multi-byte character
+		if ($v1 & 0x80) //head of multi-byte character
 		{
-			$v2 = ($v1 & 0b01111000) << 1;
-			while ($v2 & 0b10000000)
+			$v2 = ($v1 & 0x70) << 1;
+			while ($v2 & 0x80)
 			{
 				$i++;
-				$v3 = $str[$i];
-				$c .= $v3;
-				$v2 = ($v2 & 0b01111111 ) << 1;
+				$c .= $str[$i];
+				$v2 = ($v2 & 0x7f) << 1;
 			}
 
 			$ret += 2;
@@ -73,15 +72,14 @@ function split_line(string $str, string
 
 		// Process UTF-8 Chinese characters
 		$v1 = ord($c);
-		if (($v1 & 0b10000000) == 0b10000000) //head of multi-byte character
+		if ($v1 & 0x80) //head of multi-byte character
 		{
-			$v2 = ($v1 & 0b01111000) << 1;
-			while ($v2 & 0b10000000)
+			$v2 = ($v1 & 0x70) << 1;
+			while ($v2 & 0x80)
 			{
 				$i++;
-				$v3 = $str[$i];
-				$c .= $v3;
-				$v2 = ($v2 & 0b01111111 ) << 1;
+				$c .= $str[$i];
+				$v2 = ($v2 & 0x7f) << 1;
 			}
 
 			// Each UTF-8 CJK character should use two character length for display