qswhData=file($filename); } function decode($str,$pattern=0){ $arr=array("/&#(/w+);/iU","/((%">

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php汉字转码Unicode(UTF8)至GBK编码转换

//php汉字转码
class qswhU{
var $qswhData;
function qswhU($filename="qswhU.php"){
$this->qswhData=file($filename);
}
function decode($str,$pattern=0){
$arr=array("/&#(/w+);/iU","/((%/w/w)+)/i","/%u(/w{4,5})/iU");
if(is_integer($pattern)){
if($pattern>=count($arr))die("Invalid Function");
$pattern=$arr[$pattern];
}
return preg_replace_callback($pattern,array($this,"u2gb"),$str);
} // 程序员之家 bbs.it-home.org
function u2gb($arr){
/******(qiushuiwuhen 2002-8-15)******/
$ret="";$str=$arr[1];
if(preg_match_all("/%/w{2}/",$str,$matches)){
for($i=0;$i $chr1=hexdec(substr($matches[0][$i],1));
$arr=array("f0","e0","c0","0");
for($j=0;$jhexdec($arr[$j]))break;
$chr=hexdec(substr($matches[0][$i],1))-hexdec($arr[$j]);
while(++$j $str=dechex($chr);
if(strlen($str)==4){
$p=hexdec(substr($str,0,2))-0x4d;
$q=hexdec(substr($str,2))*4;
$ret.=chr(hexdec(substr($this->qswhData[$p],$q,2)));
$ret.=chr(hexdec(substr($this->qswhData[$p],$q+2,2)));
}else
$ret.=chr(hexdec($str));
}
}
else{
if(strtolower($str[0])=="x")
$str=substr($str,1);
else
if(strlen($str)!=4)$str=dechex($str);
if(strlen($str)==4){
$p=hexdec(substr($str,0,2))-0x4d;
$q=hexdec(substr($str,2))*4;
$ret.=chr(hexdec(substr($this->qswhData[$p],$q,2)));
$ret.=chr(hexdec(substr($this->qswhData[$p],$q+2,2)));
}else
$ret.=chr(hexdec($str));
}
return $ret;
}
}

使用实例：

$qswh=new qswhU("qswhU.php");//如果文件名是qswhU.php,可省参数
echo "