PHP中GBK和UTF8编码处理

发布时间：2020-12-13 14:11:55 所属栏目：PHP教程来源：网络整理

导读：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:

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

//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, 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);
}

三、参考文档

http://www.unicode.org/
http://examples.oreilly.com/cjkvinfo/doc/cjk.inf
http://www.ansell-uebersetzungen.com/gbuni.html
http://www.haiyan.com/steelk/navigator/ref/gbk/gbindex.htm
http://baike.baidu.com/view/40801.htm
http://www.chedong.com/tech/hello_unicode.html

原文链接：http://blog.csdn.net/heiyeshuwu/archive/2007/01/20/1488900.aspx

（编辑：李大同）

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