function chinesefirst($str)
{
$str= iconv("utf-8","gb2312", $str); //如果程序是gbk的,此行就要注释掉
//判断字符串是否全都是中文
if (preg_match("/^[\x7f-\xff]/", $str))
{
$fchar=ord($str{0});
if($fchar>=ord("a") and $fchar<=ord("z") )return strtoupper($str{0});
$a = $str;
$val=ord($a{0})*256+ord($a{1})-65536;
if($val>=-20319 and $val<=-20284)return "a";
if($val>=-20283 and $val<=-19776)return "b";
if($val>=-19775 and $val<=-19219)return "c";
if($val>=-19218 and $val<=-18711)return "d";
if($val>=-18710 and $val<=-18527)return "e";
if($val>=-18526 and $val<=-18240)return "f";
if($val>=-18239 and $val<=-17923)return "g";
if($val>=-17922 and $val<=-17418)return "h";
if($val>=-17417 and $val<=-16475)return "j";
if($val>=-16474 and $val<=-16213)return "k";
if($val>=-16212 and $val<=-15641)return "l";
if($val>=-15640 and $val<=-15166)return "m";
if($val>=-15165 and $val<=-14923)return "n";
if($val>=-14922 and $val<=-14915)return "o";
if($val>=-14914 and $val<=-14631)return "p";
if($val>=-14630 and $val<=-14150)return "q";
if($val>=-14149 and $val<=-14091)return "r";
if($val>=-14090 and $val<=-13319)return "s";
if($val>=-13318 and $val<=-12839)return "t";
if($val>=-12838 and $val<=-12557)return "w";
if($val>=-12556 and $val<=-11848)return "x";
if($val>=-11847 and $val<=-11056)return "y";
if($val>=-11055 and $val<=-10247)return "z";
} else
{
return false;
}
}
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