gbk字符串长度

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教程: 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

//判断内容里有没有中文-gbk (php教程)

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++;

    }

    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

}

//判断是否是含有韩文-utf-8 (网页特效)

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);

}