用php实现gb2312和unicode间的编码转换

　　gb2312 和 unicode 间的编码转换
下面的例子是将 gb2312 转换为 全这种形式
php4.3.1以后的iconv函数很好用的，只是需要自己写一个uft8到unicode的转换函数
查表(gb2312.txt)也行
复制代码 代码如下:
<?
$text = 脚本之家;
preg_match_all(/[\x80-\xff]?./,$text,$ar);
foreach($ar[0] as $v)
echo .utf8_unicode(iconv(GB2312,UTF-8,$v)).;;
?>
<?
// utf8 -> unicode
function utf8_unicode($c) {
switch(strlen($c)) {
case 1:
return ord($c);
case 2:
$n = (ord($c[0]) & 0x3f) << 6;
$n += ord($c[1]) & 0x3f;
return $n;
case 3:
$n = (ord($c[0]) & 0x1f) << 12;
$n += (ord($c[1]) & 0x3f) << 6;
$n += ord($c[2]) & 0x3f;
return $n;
case 4:
$n = (ord($c[0]) & 0x0f) << 18;
$n += (ord($c[1]) & 0x3f) << 12;
$n += (ord($c[2]) & 0x3f) << 6;
$n += ord($c[3]) & 0x3f;
return $n;
}
}
?>

下面的例子是利用php将全这中编码转换为gb2312.
复制代码 代码如下:
<?php
$str = TTL全天候自动聚焦;
$str = preg_replace(([0-9]{1,5});, \.u2utf82gb(\\1).\, $str);
$str = \$str=\$str\;;
eval($str);
echo $str;
function u2utf82gb($c){
$str=;
if ($c < 0x80) {
$str.=$c;
} else if ($c < 0x800) {
$str.=chr(0xC0 $c>>6);
$str.=chr(0x80 $c & 0x3F);
} else if ($c < 0x10000) {
$str.=chr(0xE0 $c>>12);
$str.=chr(0x80 $c>>6 & 0x3F);
$str.=chr(0x80 $c & 0x3F);
} else if ($c < 0x200000) {
$str.=chr(0xF0 $c>>18);
$str.=chr(0x80 $c>>12 & 0x3F);
$str.=chr(0x80 $c>>6 & 0x3F);
$str.=chr(0x80 $c & 0x3F);
}
return iconv(UTF-8, GB2312, $str);
}
?>

或者是
复制代码 代码如下:
function unescape($str) {
$str = rawurldecode($str);
preg_match_all(/(?:%u.{4}).{4};\d+;.+/U,$str,$r);
$ar = $r[0];
print_r($ar);
foreach($ar as $k=>$v) {
if(substr($v,0,2) == %u)
$ar[$k] = iconv(UCS-2,GB2312,pack(H4,substr($v,-4)));
elseif(substr($v,0,3) == )
$ar[$k] = iconv(UCS-2,GB2312,pack(H4,substr($v,3,-1)));
elseif(substr($v,0,2) == ) {
echo substr($v,2,-1).<br>;
$ar[$k] = iconv(UCS-2,GB2312,pack(n,substr($v,2,-1)));
}
}
return join(,$ar);
}
$str = TTL全天候自动聚焦;
echo unescape($str); //out TTL全天候自动聚焦

利用javascript来转换
复制代码 代码如下:
<style>
BODY {
FONT-SIZE: 9pt; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; PADDING-TOP: 0px;
}
input {
FONT-SIZE: 9pt; height: 13pt;
}
</style>
<script language=JavaScript1.2>
/*
You can use it freely, but u must held all the copyright items!
*/
function Str2Unicode(str){
var arr = new Array();
for(var i=0;i<str.length;i++){
arr[i]= + str.charCodeAt(i) + ;;
}
return(arr.toString().replace(/,/g,));
}
function Unicode2oStr(str){
var re=/[\da-fA-F]{1,5};/ig;
var arr=str.match(re);
if(arr==null)return();
for(var i=0;i<arr.length;i++){
arr[i]=String.fromCharCode(arr[i].replace(/[]/g,));
}
return(arr.toString().replace(/,/g,))
}
function modi_str(){
if(document.all.text.decode.value!=){
document.all.text.encode.value = Str2Unicode(document.all.text.decode.value);
}else{
document.all.text.decode.value = Unicode2oStr(document.all.text.encode.value);
}
}else{
if(document.all.text.encode.value!=){
document.all.text.decode.value = Unicode2oStr(document.all.text.encode.value);
}else{
document.all.text.encode.value = Str2Unicode(document.all.text.decode.value);
}
}
}
</script>
<title>Unicode</title>
<form name=text>
文本原型：<br>
<textarea name=decode cols=100 rows=10></textarea>
<br>
转换代码：<br>
<textarea name=encode cols=100 rows=10></textarea>
<br>
<input type=checkbox name=method checked> 正向转换
<input type=button onclick=modi_str() value= 确 定 >
<input type=reset value= 清 空 >
<input type=button onclick=document.all.text.method.checked?document.all.text.encode.select():document.all.text.decode.select() value= 全 选 >
</form>

下面是一个显示所有全角半角的字体的查看例子
复制代码 代码如下:
<style>
BODY {
FONT-SIZE: 9pt; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; PADDING-TOP: 0px;
}
input {
FONT-SIZE: 9pt; height: 13pt;
}
</style>
<script>
function showUni(min,max){
show.document.open();
show.document.writeln(<style>body{font-size:9pt;word-break:break-all;}</style>);
show.document.writeln(min + - + max + <br><br>);
var i=0;
for(i=min;i<=max;i++){
show.document.write( + i + ;);
}
show.document.close();
}
</script>
<input type=button value=半角 onclick=showUni(32,126)>
<input type=button value=全角 onclick=showUni(65281,65374)>
<input type=button value=中文1 onclick=showUni(19968,40869)>
<input type=button value=中文2 onclick=showUni(63744,64045)>
<input type=button value=日文平 onclick=showUni(12353,12435)>
<input type=button value=日文片 onclick=showUni(12449,12534)>
<input type=button value=韩文 onclick=showUni(44032,55203)>
<br>自定义：<input name=min> - <input name=max>
<input type=button value=察看 onclick=showUni(parseInt(document.all.min.value),parseInt(document.all.max.value))>
<br>
<iframe src=about:blank id=show width=100% height=70% scroll=no></iframe>

下面是一个查表(gb2312),转换gb2312到utf8的例子, 现在有iconv函数,这个已经没有太大的意义了,
复制代码 代码如下:
<?
function gb2utf8($gb){
if(!trim($gb)) return $gb;
$filename=gb2312.txt;
$tmp=file($filename);
$codetable=array();
while(list($key,$value)=each($tmp))
$codetable[hexdec(substr($value,0,6))]=substr($value,7,6);
$utf8=;
while($gb) {
if (ord(substr($gb,0,1))>127) {
$this=substr($gb,0,2);
$gb=substr($gb,2,strlen($gb)-2);
$utf8.=u2utf8(hexdec($codetable[hexdec(bin2hex($this))-0x8080]));
}else{
$this=substr($gb,0,1);
$gb=substr($gb,1,strlen($gb)-1);
$utf8.=u2utf8($this);
}
}
return $utf8;
}
function u2utf8($c){
$str=;
if ($c < 0x80) {
$str.=$c;
} else if ($c < 0x800) {
$str.=chr(0xC0 $c>>6);
$str.=chr(0x80 $c & 0x3F);
} else if ($c < 0x10000) {
$str.=chr(0xE0 $c>>12);
$str.=chr(0x80 $c>>6 & 0x3F);
$str.=chr(0x80 $c & 0x3F);
} else if ($c < 0x200000) {
$str.=chr(0xF0 $c>>18);
$str.=chr(0x80 $c>>12 & 0x3F);
$str.=chr(0x80 $c>>6 & 0x3F);
$str.=chr(0x80 $c & 0x3F);
}
return $str;
}
?>