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//gb转utf-8编码
*******************************/
function gb2utf8($gbstr) {
global $codetable;
if(trim($gbstr)=="") return $gbstr;
if(empty($codetable)){
$filename = dirname(__file__)."/data/gb2312-utf8.table";
$fp = fopen($filename,"r");
while ($l = fgets($fp,15))
{ $codetable[hexdec(substr($l, 0, 6))] = substr($l, 7, 6); }
fclose($fp);
}
$ret = "";
$utf8 = "";
while ($gbstr) {
if (ord(substr($gbstr, 0, 1)) > 0x80) {
$thisw = substr($gbstr, 0, 2);
$gbstr = substr($gbstr, 2, strlen($gbstr));
$utf8 = "";
@$utf8 = u2utf8(hexdec($codetable[hexdec(bin2hex($thisw)) - 0x8080]));
if($utf8!=""){
for ($i = 0;$i < strlen($utf8);$i += 3)
$ret .= chr(substr($utf8, $i, 3));
}
}
else
{
$ret .= substr($gbstr, 0, 1);
$gbstr = substr($gbstr, 1, strlen($gbstr));
}
}
return $ret;
}
