【IT168 技术文档】
一、编码范围
1. GBK (GB2312/GB18030)
\x00-\xff GBK双字节编码范围
\x20-\x7f ASCII
\xa1-\xff 中文
\x80-\xff 中文
2. UTF-8 (Unicode)
\u4e00-\u9fa5 (中文)
\x3130-\x318F (韩文
\xAC00-\xD7A3 (韩文)
\u0800-\u4e00 (日文)
ps: 韩文是大于[\u9fa5]的字符
正则例子:
preg_replace("/([\x80-\xff])/","",$str); preg_replace("/([u4e00-u9fa5])/","",$str);
二、代码例子
查看原文//判断内容里有没有中文-GBK (PHP) function check_is_chinese($s){ return preg_match('/[\x80-\xff]./', $s); } //获取字符串长度-GBK (PHP) function gb_strlen($str){ $count = 0; for($i=0; $i<strlen($str); $i++){ $s = substr($str, $i, 1); if (preg_match("/[\x80-\xff]/", $s)) ++$i; ++$count; } return $count; } //截取字符串字串-GBK (PHP) function gb_substr($str, $len){ $count = 0; for($i=0; $i<strlen($str); $i++){ if($count == $len) break; if(preg_match("/[\x80-\xff]/", substr($str, $i, 1))) ++$i; ++$count; } return substr($str, 0, $i); } //统计字符串长度-UTF8 (PHP) function utf8_strlen($str) { $count = 0; for($i = 0; $i < strlen($str); $i++){ $value = ord($str[$i]); if($value > 127) { $count++; if($value >= 192 && $value <= 223) $i++; elseif($value >= 224 && $value <= 239) $i = $i + 2; elseif($value >= 240 && $value <= 247) $i = $i + 3; else die('Not a UTF-8 compatible string'); } $count++; } return $count; } //截取字符串-UTF8(PHP) function utf8_substr($str,$position,$length){ $start_position = strlen($str); $start_byte = 0; $end_position = strlen($str); $count = 0; for($i = 0; $i < strlen($str); $i++){ if($count >= $position && $start_position > $i){ $start_position = $i; $start_byte = $count; } if(($count-$start_byte)>=$length) { $end_position = $i; break; } $value = ord($str[$i]); if($value > 127){ $count++; if($value >= 192 && $value <= 223) $i++; elseif($value >= 224 && $value <= 239) $i = $i + 2; elseif($value >= 240 && $value <= 247) $i = $i + 3; else die('Not a UTF-8 compatible string'); } $count++; 000-239 000-636 } return(substr($str,$start_position,$end_position-$start_position)); } //字符串长度统计-UTF8 [中文3个字节,俄文、韩文占2个字节,字母占1个字节] (Ruby) def utf8_string_length(str) temp = CGI::unescape(str) i = 0; j = 0; temp.length.times{|t| if temp[t] < 127 i += 1 elseif temp[t] >= 127 and temp[t] < 224 j += 1 if 0 == (j % 2) i += 2 j = 0 end else j += 1 if 0 == (j % 3) i +=2 j = 0 end end } return i } //判断是否是有韩文-UTF-8 (javascript) function checkKoreaChar(str) { for(i=0; i<str.length; i++) { if(((str.charCodeAt(i) > 0x3130 && str.charCodeAt(i) < 0x318F) || (str.charCodeAt(i) >= 0xAC00 && str.charCodeAt(i) <= 0xD7A3))) { return true; } } return false; } //判断是否有中文字符-GBK (javascript) function check_chinese_char(s){ return (s.length != s.replace(/[^\x00-\xff]/g,"**").length); }