PHP中GBK和UTF8编码处理

chencs

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:
PLAIN TEXT
PHP:
preg_replace("/([x80-xff])/","",$str);
preg_replace("/([u4e00-u9fa5])/","",$str);
二、代码例子
PLAIN TEXT
PHP:
//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; $ix80-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; $ix80-xff]/", substr($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  127) {
$count++;
if($value>= 192 && $value = 224 && $value = 240 && $value
if($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 = 224 && $value = 240 && $value = 127 and temp[t]  0x3130 && str.charCodeAt(i) = 0xAC00 && str.charCodeAt(i)

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