用php实现 gb2312 和 unicode 间的编码转换

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

$text = "电子书库";
preg_match_all("/[\x80-\xff]?./",$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) $n += ord($c[1]) & 0x3f;
return $n;
case 3:
$n = (ord($c[0]) & 0x1f) $n += (ord($c[1]) & 0x3f) $n += ord($c[2]) & 0x3f;
return $n;
case 4:
$n = (ord($c[0]) & 0x0f) $n += (ord($c[1]) & 0x3f) $n += (ord($c[2]) & 0x3f) $n += ord($c[3]) & 0x3f;
return $n;
}
}
?>

下面的例子是利用php将"全"这中编码转换为gb2312.
$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 $str.=$c;
} else if ($c $str.=chr(0xC0 | $c>>6);
$str.=chr(0x80 | $c & 0x3F);
} else if ($c $str.=chr(0xE0 | $c>>12);
$str.=chr(0x80 | $c>>6 & 0x3F);
$str.=chr(0x80 | $c & 0x3F);
} else if ($c $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})|.{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)."
";
$ar[$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

function Str2Unicode(str){
var arr = new Array();
for(var i=0;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[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);
}
}
}

文本原型：




转换代码：




正向转换

下面是一个显示所有全角半角的字体的查看例子

自定义： -

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 $str.=$c;
} else if ($c $str.=chr(0xC0 | $c>>6);
$str.=chr(0x80 | $c & 0x3F);
} else if ($c $str.=chr(0xE0 | $c>>12);
$str.=chr(0x80 | $c>>6 & 0x3F);
$str.=chr(0x80 | $c & 0x3F);
} else if ($c $str.=chr(0xF0 | $c>>18);
$str.=chr(0x80 | $c>>12 & 0x3F);
$str.=chr(0x80 | $c>>6 & 0x3F);
$str.=chr(0x80 | $c & 0x3F);
}
return $str;
}

?>