获取城市地址首字母

　　function getFirstChar($s){

　　$s0 = mb_substr($s,0,1,'utf-8'); //获取名字的姓

　　if ( $s0 =='亳' ) {

　　return 'B';

　　}elseif ( $s0 =='衢' ) {

　　return 'Q';

　　}elseif ( $s0 =='泸' || $s0=='漯' ) {

　　// }elseif ( $s0 =='泸' ) {

　　return 'L';

　　}elseif ( $s0 =='濮' ) {

　　return 'P';

　　}

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

　　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

　　}

　　}