public function gb2312_big5($str)
{
$str_t = '';
$len = strlen($str);
$a = 0;
while ($a < $len) {
if (ord($str[$a]) >= 224 && ord($str[$a]) <= 239) {
if (($temp = strpos($this->utf8_gb2312, $str[$a] . $str[$a + 1] . $str[$a + 2])) !== false) {
$str_t .= $this->utf8_big5[$temp] . $this->utf8_big5[$temp + 1] . $this->utf8_big5[$temp + 2];
$a += 3;
continue;
}
}
$str_t .= $str[$a];
$a += 1;
}
return $str_t;
}