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PHP中GBK和UTF8编码处理

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($s){
returnpreg_match('/[/x80-/xff]./',$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;
}
returnsubstr($str,$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::(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
}
returni
}

//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;
}
}
returnfalse;
}
//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

另：

public function csubstr($str,$start=0,$length,$charset="utf-8",$suffix=true) { if(function_exists("mb_substr")) return mb_substr($str,$start,$charset); $re['utf-8'] ="/[/x01-/x7f]|[/xc2-/xdf][/x80-/xbf]|[/xe0-/xef][/x80-/xbf]{2}|[/xf0-/xff][/x80-/xbf]{3}/"; $re['gb2312'] = "/[/x01-/x7f]|[/xb0-/xf7][/xa0-/xfe]/"; $re['gbk'] = "/[/x01-/x7f]|[/x81-/xfe][/x40-/xfe]/"; $re['big5'] ="/[/x01-/x7f]|[/x81-/xfe]([/x40-/x7e]|/xa1-/xfe])/"; preg_match_all($re[$charset],$str,$match); $slice = join("",array_slice($match[0],$length)); if($suffix) return $slice."…"; return $slice; }