[转] 用php实现gb2312和unicode(UTF-8)间的编码转换

civilvar

　　gb2312 和 unicode (UTF-8)间的编码转换
　　下面的例子是将 gb2312 转换为 "全"这种形式
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
<?
$text = "电子书库";
preg_match_all("/[\x80-\xff]?./",$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"&#20840;"这中编码转换为gb2312.
<?php
$str = "TTL&#20840;&#22825;&#20505;&#33258;&#21160;&#32858;&#28966;";
$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', $str);
}
?>
　　或者是
　　function unescape($str) {
$str = rawurldecode($str);
preg_match_all("/(?:%u.{4})|&#x.{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) == "&#x")
$ar[$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);
}
　　$str = "TTL&#20840;&#22825;&#20505;&#33258;&#21160;&#32858;&#28966;";
echo unescape($str); //out TTL全天候自动聚焦
　　利用javascript来转换
　　<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">
/*
This following code are designed and writen by Windy_sk <seasonx@163.net>
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="&#" + 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=String.fromCharCode(arr.replace(/[&#;]/g,""));
}
return(arr.toString().replace(/,/g,""))
}
　　function modi_str(){
if(document.all.text.method.checked){
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  value=" 确 定 ">
<input type=reset value=" 清 空 ">
<input type=button  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
　　<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,
　　<?
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;
}
　　?>