function getfirstchar($s0)));
if (($firstchar_ord>=65 and $firstchar_ord<=91)or($firstchar_ord>=48 and $firstchar_ord<=57)) return $s0;
$s=iconv("utf-8","gb2312", $s0);
$asc=ord($s)*256+ord($s)-65536;
if($asc>=-20319 and $asc<=-20284)return "a";
if($asc>=-20283 and $asc<=-19776)return "b";
if($asc>=-19775 and $asc<=-19219)return "c";
if($asc>=-19218 and $asc<=-18711)return "d";
if($asc>=-18710 and $asc<=-18527)return "e";
if($asc>=-18526 and $asc<=-18240)return "f";
if($asc>=-18239 and $asc<=-17923)return "g";
if($asc>=-17922 and $asc<=-17418)return "h";
if($asc>=-17417 and $asc<=-16475)return "j";
if($asc>=-16474 and $asc<=-16213)return "k";
if($asc>=-16212 and $asc<=-15641)return "l";
if($asc>=-15640 and $asc<=-15166)return "m";
if($asc>=-15165 and $asc<=-14923)return "n";
if($asc>=-14922 and $asc<=-14915)return "o";
if($asc>=-14914 and $asc<=-14631)return "p";
if($asc>=-14630 and $asc<=-14150)return "q";
if($asc>=-14149 and $asc<=-14091)return "r";
if($asc>=-14090 and $asc<=-13319)return "s";
if($asc>=-13318 and $asc<=-12839)return "t";
if($asc>=-12838 and $asc<=-12557)return "w";
if($asc>=-12556 and $asc<=-11848)return "x";
if($asc>=-11847 and $asc<=-11056)return "y";
if($asc>=-11055 and $asc<=-10247)return "z";
return null;
}echo getfirstchar("哈哈");
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