用php实现 gb2312 和 unicode 间的编码转换

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);
  }
 }
}

下面是一个显示所有全角半角的字体的查看例子

<script><br/>function showUni(min,max){<br/> show.document.open();<br/> show.document.writeln("<style>body{font-size:9pt;word-break:break-all;}");<br/> show.document.writeln(min + " - " + max + "<br><br>");<br/> var i=0;<br/> for(i=min;i<=max;i++){<br/> show.document.write("&#" + i + ";");<br/> }<br/> show.document.close();<br/>}<br/></script>








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;
}

?>