汉字获取首字母

public  static getFirstChar($s){

$s0 = mb_substr($s,0,3); //获取名字的姓

$s = iconv('UTF-8','gb2312', $s0); //将UTF-8转换成GB2312编码

//dump($s0);

if (ord($s0)>128) { //汉字开头，汉字没有以U、V开头的

    $asc=ord($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<=-17760)return "G";

    if($asc>=-17759 and $asc<=-17248)return "H";

    if($asc>=-17247 and $asc<=-17418)return "I";

    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";

}else if(ord($s)>=48 and ord($s)<=57){ //数字开头

    switch(iconv_substr($s,0,1,'utf-8')){

        case 1:return "Y";

        case 2:return "E";

        case 3:return "S";

        case 4:return "S";

        case 5:return "W";

        case 6:return "L";

        case 7:return "Q";

        case 8:return "B";

        case 9:return "J";

        case 0:return "L";

    }

}else if(ord($s)>=65 and ord($s)<=90){ //大写英文开头

    return substr($s,0,1);

}else if(ord($s)>=97 and ord($s)<=122){ //小写英文开头

    return strtoupper(substr($s,0,1));

}

else

{

    return iconv_substr($s0,0,1,'utf-8');

    //中英混合的词语，不适合上面的各种情况，因此直接提取首个字符即可

}

}