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
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. 
 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 
 代码如下:

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 
 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"> 
/* 
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[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.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 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 
 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, 
 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; 
} 
?>