类别: PHP教程 
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
<?
$text = \"电子书库\";
preg_match_all(\"/[/x80-/xff]?./\",$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\"全\"这中编码转换为gb2312.
<?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\', $str);
}
?>
或者是
function unescape($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
<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
<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;
}
?>
