/**
* @return all UTF8 characters of $s EXCEPT FOR if they are within special ranges (Chinese characters)
*/
static function noChineseChars($s, $enc = 'UTF-8')
{
$retval = '';
$len = mb_strlen($s);
for ($i = 0; $i < $len; $i++) {
$c = mb_substr($s, $i, 1, $enc);
$code = FX::mbOrd($c);
if ($code >= 0x4e00 && $code <= 0x9fff) {
continue;
} elseif ($code >= 0x4e00 && $code <= 0x9fff) {
continue;
} elseif ($code >= 0x3400 && $code <= 0x4dff) {
continue;
} elseif ($code >= 0x20000 && $code <= 0x2a6df) {
continue;
} elseif ($code >= 0x2f800 && $code <= 0x2fa1f) {
continue;
}
$retval .= $c;
}
return $retval;
}