function getfirstchar($s0){
 if($fchar>=ord("a") and $fchar<=ord("Z") )   { return strtoupper($s0{0}); }
 $s=iconv("UTF-8","gb2312", $s0);
 $asc=ord($s{0})*256+ord($s{1})-65536;
 if($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 false; 
}
echo getfirstchar("我");