--- fenglin/lib/str_process.inc.php	2004/06/25 08:58:04	1.3
+++ fenglin/lib/str_process.inc.php	2025/04/27 04:32:05	1.17
@@ -1,69 +1,130 @@
-<?
-
-function split_line($str,$pre="",$width=75)
+<?php
+function str_length(string $str) : string
 {
-	$lines = array();
-	$lines_count = 0;
 	$len = strlen($str);
+	$ret = 0;
+
+	for ($i = 0; $i < $len; $i++)
+	{
+		$c = $str[$i];
+
+		// Process UTF-8 Chinese characters
+		$v1 = ord($c);
+		if (($v1 & 0b10000000) == 0b10000000) //head of multi-byte character
+		{
+			$v2 = ($v1 & 0b01111000) << 1;
+			while ($v2 & 0b10000000)
+			{
+				$i++;
+				$v3 = $str[$i];
+				$c .= $v3;
+				$v2 = ($v2 & 0b01111111 ) << 1;
+			}
+
+			$ret += 2;
+		}
+		else
+		{
+			$ret++;
+		}
+	}
 
-	$hz_ok = true;
-	$en_ok = true;
-	
-	if ($width<=0)
+	return $ret;
+}
+
+function split_line(string $str, string $prefix = "", int $width = 76, int $lines_limit = PHP_INT_MAX, string $end_of_line = "\n") : string
+{
+	if ($width <= 0)
+	{
 		return $str;
-	
-	$line = $pre;
-	$line_count = strlen($line);
-	for($i=0;$i<$len;$i++)
+	}
+
+	$result = "";
+	$len = strlen($str);
+	$prefix_len = str_length($prefix);
+
+	$lines_count = 0;
+
+	$line = $prefix;
+	$line_len = $prefix_len;
+	for ($i = 0; $i < $len && $lines_count < $lines_limit; $i++)
 	{
-		$line.=$str[$i];
-		$line_count++;
-		if (ord($str[$i])>127)
+		$c = $str[$i];
+
+		// Skip special characters
+		if ($c == "\r" || $c == "\7")
 		{
-			$hz_ok = (!$hz_ok);
-			$en_ok = true;
+			continue;
 		}
-		if (ord($str[$i])<=127)
+
+		if ($c == "\n")
+		{
+			if ($lines_count + 1 >= $lines_limit)
+			{
+				break;
+			}
+
+			$result .= ($line . $end_of_line);
+			$lines_count++;
+			$line = $prefix;
+			$line_len = $prefix_len;
+			continue;
+		}
+
+		// Process UTF-8 Chinese characters
+		$v1 = ord($c);
+		if (($v1 & 0b10000000) == 0b10000000) //head of multi-byte character
 		{
-			$hz_ok = true;
-			if ($str[$i] == " ")
+			$v2 = ($v1 & 0b01111000) << 1;
+			while ($v2 & 0b10000000)
 			{
-				$en_ok = true;
+				$i++;
+				$v3 = $str[$i];
+				$c .= $v3;
+				$v2 = ($v2 & 0b01111111 ) << 1;
 			}
-			else
+
+			// Each UTF-8 CJK character should use two character length for display
+			if ($line_len + 2 > $width)
 			{
-				$en_ok = false;
+				if ($lines_count + 1 >= $lines_limit)
+				{
+					break;
+				}
+
+				$result .= ($line . $end_of_line);
+				$lines_count++;
+				$line = $prefix;
+				$line_len = $prefix_len;
 			}
+			$line_len += 2;
 		}
-		if ($line_count >= $width && $hz_ok && $en_ok)
+		else
 		{
-			$lines[$lines_count++] = $line;
-			$line = $pre;
-			$line_count = strlen($line);
+			$line_len++;
 		}
-	}
-	$lines[$lines_count++] = $line;
 
-	$result = "";
-	for($i=0;$i<$lines_count;$i++)
-	{
-		$result.=($lines[$i]."\r\n");
-	}
-	return $result;
-}
+		if ($line_len > $width)
+		{
+			if ($lines_count + 1 >= $lines_limit)
+			{
+				break;
+			}
 
-function str_process($str,$pre="",$width=75)
-{
-	$result = "";
-	
-	$lines = explode("\n",str_replace("\r\n","\n",$str));
+			$result .= ($line . $end_of_line);
+			$lines_count++;
+			$line = $prefix;
+			$line_len = $prefix_len + 1;
+		}
+
+		$line .= $c;
+	}
 
-	foreach($lines as $line)
+	if ($lines_count < $lines_limit)
 	{
-		$result .= split_line($line,$pre,$width);
+		$result .= $line;
 	}
-	
+
 	return $result;
 }
-
 ?>